{"id":11392,"date":"2019-08-18T16:17:44","date_gmt":"2019-08-18T16:17:44","guid":{"rendered":"http:\/\/www.techolac.com\/?p=11392"},"modified":"2019-08-18T16:17:44","modified_gmt":"2019-08-18T16:17:44","slug":"ubuntu-grub-rescue-commands","status":"publish","type":"post","link":"https:\/\/www.techolac.com\/linux\/ubuntu-grub-rescue-commands\/","title":{"rendered":"Ubuntu Grub Rescue Commands"},"content":{"rendered":"<p>Just this very sweet morning you began your laptop and Boom! You get a black screen with a message that &#8220;Unknown Filesystem&#8221; and a message saying grub rescue. Now you are right here at Techolac to see how you can tackle out of this issue and also save your valuable data and boot typically into Linux again. Let us discuss some grub rescue commands.<\/p>\n<h2>Ways To Rescue Or Recover Grub<\/h2>\n<p>\u200bYou might be thinking about what has happened to distro. There may be many reasons. You might have installed some software, might mess with <strong>GRUB2<\/strong>, who knows you used some other distro trying dual booting and many other things. No matter what the reason may be, most of the time the problem is with the GRUB. Below are certain ways you can use to get your distro back from the screen of <em>Grub Rescue<\/em>.<\/p>\n<p><strong>Death Screen of Linux<\/strong> saying:<\/p>\n<p><strong>error: no such partition<\/strong><\/p>\n<p><strong>grub rescue<\/strong><\/p>\n<h2>Requirements and presumptions:<\/h2>\n<ul>\n<li>You must have a live CD\/DVD\/USB of the same version of OS<\/li>\n<li>You must have internet connection<\/li>\n<li>You are dual booting Windows with Ubuntu (no Wubi installation)<\/li>\n<li>You do not have a separate \/boot partition<\/li>\n<\/ul>\n<p>Now lets see how can we rescue the grub here.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"post-text\">\n<h2>To fix grub rescue go with following steps:<\/h2>\n<ul>\n<li>First thing is we have to start our OS only then after we can fix grub.\n<pre class=\"lang-sh prettyprint prettyprinted\"><code><span class=\"com\">#to start OS--&gt;<\/span><span class=\"pln\">\r\nerror<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> unknown filesystem<\/span><span class=\"pun\">.<\/span>\r\n<span class=\"typ\">Entering<\/span><span class=\"pln\"> rescue mode<\/span><span class=\"pun\">...<\/span><span class=\"pln\">\r\ngrub rescue<\/span><span class=\"pun\">&gt;<\/span><\/code><\/pre>\n<p>When you see such an error first we have to check for \u201cFilesystem\u201d is ext2&#8242;<\/p>\n<pre class=\"lang-sh prettyprint prettyprinted\"><code><span class=\"pln\">grub rescue<\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\"> ls        <\/span><span class=\"com\"># type 'ls' and hit enter to see drive partition.<\/span>\r\n<span class=\"pun\">(<\/span><span class=\"pln\">hd0<\/span><span class=\"pun\">)<\/span> <span class=\"pun\">(<\/span><span class=\"pln\">hd0<\/span><span class=\"pun\">,<\/span><span class=\"pln\">msdos6<\/span><span class=\"pun\">)<\/span> <span class=\"pun\">(<\/span><span class=\"pln\">hd0<\/span><span class=\"pun\">,<\/span><span class=\"pln\">msdos5<\/span><span class=\"pun\">)<\/span> <span class=\"pun\">(<\/span><span class=\"pln\">hd0<\/span><span class=\"pun\">,<\/span><span class=\"pln\">msdos4<\/span><span class=\"pun\">)<\/span> <span class=\"pun\">...<\/span>   <span class=\"com\"># you will see such things <\/span><\/code><\/pre>\n<\/li>\n<\/ul>\n<p>this are our drives now we have to check which one is ext2.<\/p>\n<pre class=\"lang-sh prettyprint prettyprinted\"><code><span class=\"pln\">grub rescue<\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\">ls <\/span><span class=\"pun\">(<\/span><span class=\"pln\">hd0<\/span><span class=\"pun\">,<\/span><span class=\"pln\">msdos6<\/span><span class=\"pun\">)<\/span><span class=\"pln\">\r\nerror<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> disk <\/span><span class=\"str\">'hd,msdos6'<\/span><span class=\"pln\"> not found<\/span><span class=\"pun\">.<\/span><\/code><\/pre>\n<p>go for another drives until you get \u201cFilesystem is ext2\u201d.<\/p>\n<pre class=\"lang-sh prettyprint prettyprinted\"><code><span class=\"pln\">grub rescue<\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\">ls <\/span><span class=\"pun\">(<\/span><span class=\"pln\">hd0<\/span><span class=\"pun\">,<\/span><span class=\"pln\">msdos5<\/span><span class=\"pun\">)<\/span><span class=\"pln\">\r\nerror<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> disk <\/span><span class=\"str\">'hd,msdos5'<\/span><span class=\"pln\"> not found<\/span><span class=\"pun\">.<\/span><span class=\"pln\">\r\ngrub rescue<\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\">ls <\/span><span class=\"pun\">(<\/span><span class=\"pln\">hd0<\/span><span class=\"pun\">,<\/span><span class=\"pln\">msdos2<\/span><span class=\"pun\">)<\/span>\r\n<span class=\"pun\">(<\/span><span class=\"pln\">hd0<\/span><span class=\"pun\">,<\/span><span class=\"pln\">msdos2<\/span><span class=\"pun\">):<\/span> <span class=\"typ\">Filesystem<\/span><span class=\"pln\"> is ext2        <\/span><span class=\"com\"># this is what we want<\/span><\/code><\/pre>\n<p>now set the path<\/p>\n<pre class=\"lang-sh prettyprint prettyprinted\"><code><span class=\"pln\">grub rescue<\/span><span class=\"pun\">&gt;<\/span><span class=\"kwd\">set<\/span><span class=\"pln\"> boot<\/span><span class=\"pun\">=(<\/span><span class=\"pln\">hd0<\/span><span class=\"pun\">,<\/span><span class=\"pln\">msdos2<\/span><span class=\"pun\">)<\/span><span class=\"pln\">\r\ngrub rescue<\/span><span class=\"pun\">&gt;<\/span><span class=\"kwd\">set<\/span><span class=\"pln\"> prefix<\/span><span class=\"pun\">=(<\/span><span class=\"pln\">hd0<\/span><span class=\"pun\">,<\/span><span class=\"pln\">msdos6<\/span><span class=\"pun\">)\/<\/span><span class=\"pln\">boot<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">grub\r\ngrub rescue<\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\">insmod normal\r\ngrub rescue<\/span><span class=\"pun\">&gt;<\/span><span class=\"pln\">normal<\/span><\/code><\/pre>\n<ul>\n<li>Now just fix grub by following command on any Ubuntu\n<pre class=\"lang-sh prettyprint prettyprinted\"><code><span class=\"pln\">sudo grub<\/span><span class=\"pun\">-<\/span><span class=\"pln\">install <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">dev<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">sda\r\nsudo apt<\/span><span class=\"pun\">-<\/span><span class=\"pln\">get update\r\n<\/span><span class=\"com\"># to update grub<\/span><span class=\"pln\">\r\nsudo apt<\/span><span class=\"pun\">-<\/span><span class=\"pln\">get upgrade<\/span><\/code><\/pre>\n<\/li>\n<\/ul>\n<p>make sure you must update grub after login into OS<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<h2>How To Fix: error: no such partition grub rescue<\/h2>\n<p>We\u2019ll be using chroot to rescue grub. The whole concept is that since grub configuration files have been deleted or corrupted, it needs to be re-installed. And using the live CD of exact OS version, we can install the grub configuration again. It will delete all the changes (if any) you have made to the grub.<\/p>\n<p>Please follow these steps to <strong>easily fix grub rescue problem in Ubuntu<\/strong> (or other Linux distributions):<\/p>\n<h3>Step 1: Know you root partition<\/h3>\n<p>Boot from live CD, DVD or USB drive. Try Ubuntu from live disk. Open a terminal (Ctrl+Alt+T) and use the following command:<\/p>\n<pre><code>sudo su\r\nfdisk -l<\/code><\/pre>\n<p>Here, you will see the drive name and partition number. It should look like <strong>sdXY<\/strong>. Where <strong>X<\/strong> is the drive letter and <strong>Y<\/strong> is the partition number. Usually it should be like sd<strong>a<\/strong>Y.\u00a0 You have to recognize the partition where root has been installed.<\/p>\n<h3>Step 2: Mount the root partition<\/h3>\n<p>Once we have got the partition where root has been installed, we\u2019ll mount the root partition where Ubuntu has been installed. Use the following commands to mount it:<\/p>\n<pre><code>sudo mkdir \/mnt\/temp\r\nsudo mount \/dev\/sd<b>XY<\/b> \/mnt\/temp<\/code><\/pre>\n<p><strong>Replace XY with appropriate values.<\/strong><\/p>\n<h3>Step 3: Be the CHROOT<\/h3>\n<p>Once we have the partition mounted, next step is to mount certain items in preparation of the <a class=\"external\" href=\"https:\/\/en.wikipedia.org\/wiki\/Chroot\" target=\"_blank\" rel=\"noopener noreferrer\">chroot<\/a>. Run the following commands one by one:<\/p>\n<pre><code>for i in \/dev \/dev\/pts \/proc \/sys; do sudo mount -B $i \/mnt\/temp$i;  done\r\nsudo cp \/etc\/resolv.conf \/mnt\/temp\/etc\/resolv.conf\r\nsudo chroot \/mnt\/temp<\/code><\/pre>\n<p>&nbsp;<\/p>\n<p>If the above commands ran successfully, you\u2019ll see <strong>root@ubuntu:\/#<\/strong> in the terminal indicating that you are in <strong>chroot<\/strong> mode.<\/p>\n<h3>Step 4: Purge Grub 2 packages<\/h3>\n<p>Now when we are in chroot environment (you can think of it as if we are behaving as root for the mounted partition)., time to get rid of the Grub 2 packages but before that lets update the repository.<\/p>\n<pre><code>apt-get update\r\napt-get purge grub grub-pc grub-common<\/code><\/pre>\n<p>While removing the grub, you\u2019ll see a strange screen asking if you want to remove Grub 2 packages. <strong>Press TAB<\/strong> to select Yes. It will be highlighted once selected. <strong>Press enter<\/strong> to proceed.<\/p>\n<p><a class=\"external\" href=\"https:\/\/i1.wp.com\/itsfoss.com\/wp-content\/uploads\/2013\/06\/Grub_Rescue-Ubuntu.jpeg?ssl=1\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-1892 jetpack-lazy-image jetpack-lazy-image--handled\" src=\"http:\/\/techolac.com\/wp-content\/uploads\/2019\/08\/Grub_Rescue-Ubuntu.jpg\" sizes=\"(max-width: 600px) 100vw, 600px\" srcset=\"http:\/\/techolac.com\/wp-content\/uploads\/2019\/08\/Grub_Rescue-Ubuntu.jpg 600w, http:\/\/techolac.com\/wp-content\/uploads\/2019\/08\/1_Grub_Rescue-Ubuntu.jpg 300w\" alt=\"Solving Error no such partition grub rescue in Ubuntu\" width=\"600\" height=\"237\" data-recalc-dims=\"1\" data-lazy-loaded=\"1\" \/><\/a><\/p>\n<h3>Step 5: Re-install Grub packages<\/h3>\n<p>As we deleted the previous Grub, we deleted the messed up settings as well as any favourite settings stored in it. Now we\u2019ll install a new and fresh Grub. Few things to keep in mind before you go on with the command to install the Grub.<\/p>\n<ul>\n<li>While installing the new Grub, it will ask you to add extra kernel options. Just press TAB to go to OK and press enter to continue.<\/li>\n<li>It will bring you the installation notes. Press Tab to OK followed by enter and continue.<\/li>\n<li>When it presents with you the device option (to ask on which partition should it install Grub), choose the option in the format of <strong>sdX. DO NOT <\/strong>select the drive partition in 4 letter format i.e. sda4 etc. When you select the partition,\u00a0 it should have an asterisk (*) before it like [*] sdX. If it does not, highlight (with tab) and press SPACE to select it. Tab OK and press enter.<\/li>\n<\/ul>\n<div id=\"itsfoss_300x250_320x50_DynamicAds3\" class=\"freestario\" data-slot=\"waiting\" data-google-query-id=\"CJC_ys7njOQCFa9jFQgd6tYCag\">\n<div id=\"google_ads_iframe_\/15184186\/itsfoss_300x250_320x50_DynamicAds_1__container__\"><\/div>\n<\/div>\n<p><a class=\"external\" href=\"https:\/\/i1.wp.com\/itsfoss.com\/wp-content\/uploads\/2013\/06\/Grub-Rescue-Ubuntu-13.04.jpeg?ssl=1\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-1893 jetpack-lazy-image jetpack-lazy-image--handled\" src=\"http:\/\/techolac.com\/wp-content\/uploads\/2019\/08\/Grub-Rescue-Ubuntu-13.04.jpg\" sizes=\"(max-width: 600px) 100vw, 600px\" srcset=\"http:\/\/techolac.com\/wp-content\/uploads\/2019\/08\/Grub-Rescue-Ubuntu-13.04.jpg 600w, http:\/\/techolac.com\/wp-content\/uploads\/2019\/08\/1_Grub-Rescue-Ubuntu-13.04.jpg 300w\" alt=\"Solve Error no such partition grub rescue in Ubuntu\" width=\"600\" height=\"337\" data-recalc-dims=\"1\" data-lazy-loaded=\"1\" \/><\/a><\/p>\n<p>Now when you taken all those things in mind, use the command below to install the Grub.<\/p>\n<pre><code>apt-get install grub-common grub-pc<\/code><\/pre>\n<p>Update the grub and exit the chroot:<\/p>\n<pre><code>update-grub \r\nexit<\/code><\/pre>\n<h3>Step 6: Unmount the partition:<\/h3>\n<p>We mounted something at the start, didn\u2019t we? Well lets just unmount them.<\/p>\n<pre><code>for i in \/dev\/pts \/dev \/proc \/sys; do sudo umount \/mnt\/temp$i ; done<\/code><\/pre>\n<p>That\u2019s it. Reboot your system and you should see the good old Grub boot screen as before. I hope this tutorial helped you to get rid of <strong>error: no such partition grub rescue<\/strong> problem and the tutorial was easy to follow. Any question, suggestions or a word of thanks is always welcomed. Stay tuned for more Linux tutorials.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Just this very sweet morning you began your laptop and Boom! You get a black screen with a message that &#8220;Unknown Filesystem&#8221; and a message saying grub rescue. Now you are right here at Techolac to see how you can tackle out of this issue and also save your valuable data and boot typically into [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11393,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[1374,1376,1377,1375,134],"class_list":["post-11392","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","tag-grub","tag-grub-rescue","tag-partition-grub-rescue","tag-rescue-commands","tag-ubuntu"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ubuntu Grub Rescue Commands - Techolac<\/title>\n<meta name=\"description\" content=\"In this article u can get the commends to hanndle grub resuce. 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