{"id":1221,"date":"2017-09-03T11:12:20","date_gmt":"2017-09-03T11:12:20","guid":{"rendered":"http:\/\/www.penguino.co.uk\/?p=1221"},"modified":"2018-04-02T20:22:47","modified_gmt":"2018-04-02T20:22:47","slug":"proxmox-converted-ubuntu-6-vm-unable-boot","status":"publish","type":"post","link":"http:\/\/www.penguino.co.uk\/computing\/proxmox-converted-ubuntu-6-vm-unable-boot","title":{"rendered":"Proxmox &#8211; converted ubuntu 6 vm unable to boot"},"content":{"rendered":"\n<!-- SEO Ultimate (http:\/\/www.seodesignsolutions.com\/wordpress-seo\/) - Code Inserter module -->\n<!-- SEO Ultimate before item content-->\r\n<!-- #SEO Ultimate before item content-->\n<!-- \/SEO Ultimate -->\n\n<p><a href=\"http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/proxmox.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1225\" src=\"http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/proxmox.png\" alt=\"\" width=\"514\" height=\"98\" srcset=\"http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/proxmox.png 514w, http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/proxmox-300x57.png 300w\" sizes=\"(max-width: 514px) 100vw, 514px\" \/><\/a><\/p>\n<p>After converting a couple of legacy &nbsp;Ubuntu 6(!) &nbsp;VMs from ESXi vmdks to qcow2, in Proxmox I setup the vm guests and chose the SATA interface for the qcow2 images.<\/p>\n<p>During boot up, grub was showing the error&nbsp;<\/p>\n<pre>\"Begin: Waiting for root file system... ...\"<\/pre>\n<p>And after a minute or two waiting.<\/p>\n<pre>\"ALERT! \/dev\/sda1 does not exist. Dropping to a shell!\"<\/pre>\n<p>and eventually it dropped into Busybox and unable to boot.<\/p>\n<p><a href=\"http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/image004.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1223\" src=\"http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/image004.png\" alt=\"\" width=\"511\" height=\"156\" srcset=\"http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/image004.png 511w, http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/image004-300x92.png 300w\" sizes=\"(max-width: 511px) 100vw, 511px\" \/><\/a><\/p>\n<p>To resolve this:-<\/p>\n<ul>\n<li>change the guest vm interface to IDE (you need to edit the \/etc\/pve\/qemu\/&lt;vm-id&gt;.conf corresponding to your VM.<\/li>\n<li>Reboot &#8211; press the ESC key to load the grub menu<\/li>\n<li>In grub menu scroll to select the <strong>recovery<\/strong> <strong>mode<\/strong>&nbsp;and hit enter to boot<\/li>\n<\/ul>\n<p>Then when you get dumped into Busy box again, you can now list the disks and partition names using <strong>ls \/dev\/h*<\/strong><\/p>\n<p>In the following example, the partitions were assigned as \/dev\/hdb \/dev\/hdb1 and \/dev\/hdb2 by Ubuntu. &nbsp;<\/p>\n<p><a href=\"http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/image003-1.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1227\" src=\"http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/image003-1.png\" alt=\"\" width=\"477\" height=\"240\" srcset=\"http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/image003-1.png 477w, http:\/\/www.penguino.co.uk\/wp-content\/uploads\/2017\/09\/image003-1-300x151.png 300w\" sizes=\"(max-width: 477px) 100vw, 477px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>In my case, the root file system has changed to \/dev\/hdb1, so all I had left to do is<\/p>\n<ol>\n<li>Reboot again &#8211; press the ESC key to boot into grub menu<\/li>\n<li>In grub menu scroll to select the <strong>recovery<\/strong> <strong>mode<\/strong> and press e to edit the command<\/li>\n<li>change the root device from \/dev\/sda1 to hdb1, press b to boot<\/li>\n<\/ol>\n<pre style=\"padding-left: 60px;\">linux \/boot\/vmlinuz-3.13.0-29-generic root=\/dev\/<strong>hdb1<\/strong><\/pre>\n<p>Ubuntu will be able to find the kernel and complete the boot. But you will ended up in recovery mode and need to patch a few of things before rebooting properly the next time:-<\/p>\n<ol>\n<li>Edit <strong>\/etc\/grub.d\/menu.lst<\/strong> and fix the root device entry, so the next time Ubuntu can boot from the correct root device.<\/li>\n<li><strong>Swap partition<\/strong> &#8211; if your VM has a swap partition, most likely it has failed too and the device it has been renamed to \/dev\/hdb2 or \/dev\/hdb5, etc. You should be able to identity it using <strong>blkid. <\/strong>You may need to use <strong>swapon<\/strong> to re-activate it. See <a href=\"http:\/\/www.thegeekstuff.com\/2010\/08\/how-to-add-swap-space\/\" target=\"_blank\" rel=\"noopener\">this guide<\/a>&nbsp;for details.<\/li>\n<li><strong>\/etc\/fstab<\/strong> &#8211; edit this so the mount and swap device name are updated too.<\/li>\n<\/ol>\n<p>In the next reboot, your Ubuntu VM should find the root device and will boot up normally.<\/p>\n<h6>######################################<\/h6>\n<h4><strong>2 April 2018<\/strong><\/h4>\n<p>I found myself in a similar, but a more difficult situation again.<\/p>\n<p>Using Clonezilla, I was cloning a VMWare Workstation VM to a Proxmox VM over the network using server-client mode.<\/p>\n<p>After cloning, when I tried booting the Proxmox VM, the disks are not available, I was unable to see any disks even in recovery mode, neither with sata or scsi on Proxmox!<\/p>\n<p>A helping tip <a href=\"https:\/\/www.linuxquestions.org\/questions\/debian-26\/booting-to-initramfs-gave-up-waiting-dev-disk-by-uuid-xxxx-does-not-exist-4175585901\/\" target=\"_blank\" rel=\"noopener\">https:\/\/www.linuxquestions.org\/questions\/debian-26\/booting-to-initramfs-gave-up-waiting-dev-disk-by-uuid-xxxx-does-not-exist-4175585901\/<\/a> showed me the way.<\/p>\n<ol>\n<li>Boot up in Clonezilla (or closest Linux distro)<\/li>\n<li>Jump into command prompt (Clonezilla) or rescue mode (Ubuntu distro)<\/li>\n<li>Reinitialse the initramfs using the following commands (note I missed out the depmod command from the original article):<\/li>\n<\/ol>\n<pre style=\"padding-left: 60px;\">mount \/dev\/sda1 \/mnt\r\nmount --bind \/dev \/mnt\/dev\r\nmount --bind \/proc \/mnt\/proc\r\nmount --bind \/sys \/mnt\/sys\r\nchroot \/mnt\r\ndepmod `uname -r`&nbsp; &nbsp;&lt;---- I omitted this\r\nupdate-initramfs -u\r\nupdate-grub\r\nreboot<\/pre>\n<p>Afterwards the cloned VM was able to see the drive and became bootable. I guess by chroot the mounted partition and updated the initramfs did the trick.<\/p>\n<p>You may have to fix the swap partition as aforementioned if necessary.<\/p>\n<p>&nbsp;<\/p>\n\n<!-- SEO Ultimate (http:\/\/www.seodesignsolutions.com\/wordpress-seo\/) - Code Inserter module -->\n<!-- SEO Ultimate after item content-->\r\n<!-- #SEO Ultimate after item content-->\n<!-- \/SEO Ultimate -->\n\n","protected":false},"excerpt":{"rendered":"<p>After converting a couple of legacy &nbsp;Ubuntu 6(!) &nbsp;VMs from ESXi vmdks to qcow2, in Proxmox I setup the vm guests and chose the SATA interface for the qcow2 images. During boot up, grub was showing the error&nbsp; &#8220;Begin: Waiting for root file system&#8230; &#8230;&#8221; And after a minute or two waiting. &#8220;ALERT! \/dev\/sda1 does [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1227,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_s2mail":"yes","ngg_post_thumbnail":0},"categories":[3,14,356,13,355],"tags":[361,360,357,359,358],"_links":{"self":[{"href":"http:\/\/www.penguino.co.uk\/wp-json\/wp\/v2\/posts\/1221"}],"collection":[{"href":"http:\/\/www.penguino.co.uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.penguino.co.uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.penguino.co.uk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.penguino.co.uk\/wp-json\/wp\/v2\/comments?post=1221"}],"version-history":[{"count":0,"href":"http:\/\/www.penguino.co.uk\/wp-json\/wp\/v2\/posts\/1221\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.penguino.co.uk\/wp-json\/wp\/v2\/media\/1227"}],"wp:attachment":[{"href":"http:\/\/www.penguino.co.uk\/wp-json\/wp\/v2\/media?parent=1221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.penguino.co.uk\/wp-json\/wp\/v2\/categories?post=1221"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.penguino.co.uk\/wp-json\/wp\/v2\/tags?post=1221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}