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this is what I get when I'm trying to boot it up. Any help?

pizwee
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    boot an old kernel – Panther Sep 17 '17 at 15:49
  • Well, I'm unable to do anything. How should I proceed? Push some button to access Grub or boot from a USB stick? – pizwee Sep 17 '17 at 15:52
  • https://askubuntu.com/questions/82140/how-can-i-boot-with-an-older-kernel-version – Panther Sep 17 '17 at 15:56
  • I managed to find that before you answered and also booted into an older kernel without any issues. Is there anything else I should do to prevent that in the future? – pizwee Sep 17 '17 at 15:58
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    file a bug report against the new kernel. – Panther Sep 17 '17 at 16:10
  • After removing use this: https://askubuntu.com/questions/764241/how-to-remove-new-kernel-and-make-older-default-16-04 to remove that faulty kernel – George Udosen Sep 17 '17 at 16:26
  • There is a 3.2.0-126 kernel (and maybe even more recent than that, I don't know). Suggest you try it, as maybe your issue with 3.2.0-121 has been fixed. – Doug Smythies Sep 17 '17 at 16:32
  • Most likely the latest kernel upgrade didn't finish. A good solution would be to re-install the latest kernel, or running sudo apt full upgrade from the working kernel. – Pilot6 Sep 17 '17 at 18:23

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As soon as your system/server starts to boot press C key. In this mode,select a different kernel and try to boot in it.

If it fails then you need to first backup everthing using a live linux distro.

Now as its a kernel panic you would need to first mount the partiton in live mode. In this case I first suggest you to install new kernel and update the grub

Step 1: Boot using a live CD/USB

Step 2: type command df -h and obtain the partition where Ubuntu is installed

Step 3 : Mount the partiton where ubuntu is using the Command sudo mount /dev/sdX /mnt where X matches the partition title.

Step 4 : Now its time to get new kernels so either download it before hand or you may do it now.

Goto ubuntu kernel, select the latest kernel. In my case its v4.14-rc1, so click that. Now based on your server arch you can download the kernels. To know the arch,type the command uname -a to get a fair knowledge of the kernel arch. X86 shows its 32 bits, x86_64 shows its a 64 bits processor with support for 32. So I would download these in case of 64 bits

  • linux-headers-4.14.0-041400rc1_4.14.0-041400rc1.201709162031_all.deb
  • linux-headers-4.14.0-041400rc1-generic_4.14.0-041400rc1.201709162031_amd64.deb
  • linux-image-4.14.0-041400rc1-generic_4.14.0-041400rc1.201709162031_amd64.deb

You can do these either by making a text file (I would call it as kernel.list) having all the links, saving that and then using wget to download these all. In your case it should be 

sudo wget -i /dev/sdx/kernel.list

Then type

sudo dpkg -i *.deb --root-directory=/mnt/ /dev/sdX

This will install all the kernel file at /dev/sdx to its mounted volume at /mnt. or you could simply do the wget -i kernel.list on another machine. Copy paste it to /dev/sdx using the command `

sudo cp /usb_driver /dev/sdx

and then install kernel by

sudo dpkg -i *.deb --root-directory=/mnt/ /dev/sdX

Step 5: Now in terminal type

sudo grub-install --root-directory=/mnt/ /dev/sdX

these will re-install grub2.

Step 6: Now simply reboot , command "sudo reboot" and check wheter it works or not.

Note :

  • Step 5 installs new kernel
  • Step 6 re installs grub2 so that your bootloader is fixed and is linked with your new kernel.
SIDDHARTH
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  • thanks George for helping me out by formatting my post/answer. – SIDDHARTH Sep 17 '17 at 18:15
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    Why do you think installing a RC kernel is a good solution? – Pilot6 Sep 17 '17 at 18:22
  • Though rc aka release candidate can be thought as an unstable kernel. Its usually not due to agile/scrum nature of Linux Kernel. Now a new kernel brings lots of security feature,new updates and new drivers for sure. If you are still not satisfied you may consider a stable/generic kernel yourself , but I have my own experiences stating that If one knows what he/she is doing,then he/she can fix it. – SIDDHARTH Sep 17 '17 at 18:31
  • Example : Previously I used Ubuntu Trusty , which was working fine. All of a sudden my audio stoped woking and it left my system audio less. I had then re installed/purge/install alsa,alsa-base,pulseaudio,pavucontrol lots of times. It still didnt get fixed. So instead I simply upgraded to the newest kernel ,ubuntu had and re installed all the audio packages once more and lo audio was back. – SIDDHARTH Sep 17 '17 at 18:31
  • Following your recommendation, I booted an old kernel and chose the "easy" option of doing a dist upgrade (it needed one anyway). It upgraded itself to 14.04 with a 3.13.0-129 kernel which obviously fixed the problem. Anyway I'll be reinstalling that server as it's been causing me a few problems lately.

    And thank you very much for your help.

     – pizwee Sep 18 '17 at 16:22
  • I am relieved my self as the first option did the work. else fixing would had required lots of installation which is not feasible in server enviroment. However I would suggest you to create containers/hypervisor as upgrading would be far easier , you could deploy a lots of them and even mount/start one if one of them fails. – SIDDHARTH Sep 18 '17 at 16:42