Ubuntu

Ubuntu hangs on boot after upgrade to 18.04.1

Asked by Vanamali

Dear community,

I upgraded from 16.04 to 18.04.1 yesterday. The upgrade process was not smooth - dpkg showed errors when dealing with libgcc1 and libpt2.x. I solved these errors by updating libgcc1 separately and purging libpt2.x and re-doing the upgrade with "sudo apt dist-upgrade". dpkg also showed errors while updating nvidia-340 and redmine. Bug reporting for these two failed. After multiple runs of "sudo apt -f install", "sudo apt update", "sudo apt upgrade", "sudo apt autoremove", and "sudo apt dist-upgrade", the system finally had bionic. The system rebooted twice successfully. However, since morning, the boot process hangs at "Starting plymouth..." and the screen turns blank.

 I've tried adding "nomodeset" to the grub to no avail. I've tried updating the system from the recovery menu by logging in to root. But the system fails to start network service. Running "dpkg --configure -a" from the recovery menu does not return any error other than the one corresponding to flashplugin-installer (cannot download - no internet).

The boot process completes and login screen appears only in the kernel 4.4.0-133, but, I can login only to CLI. Attempt to login to GUI fails with a blank screen flashing some message that was too fast for me to read. Accessing log files through "journalctl -xb" shows multiple entries saying "Received SIGRTMIN+20 from PID 314 (plymouthd).".

I'm stuck with a CLI. Please help.

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actionparsnip
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Revision history for this message
Vanamali (vanamalishastry) said : 		#1

The laptop is a Lenovo Z50-70 with nVIDIA graphics.

Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#2

Did you install the proprietary video driver in 16.04?

Revision history for this message
Vanamali (vanamalishastry) said : 		#3

Hi actionparsnip,

 I had installed nvidia-340 driver on 16.04. However, I was using the intel
graphics driver to increase power saving.

On Fri 17 Aug, 2018, 6:57 PM actionparsnip, <
<email address hidden>> wrote:

> Your question #672395 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/672395
>
> Status: Open => Needs information
>
> actionparsnip requested more information:
> Did you install the proprietary video driver in 16.04?
>
> --
> To answer this request for more information, you can either reply to
> this email or enter your reply at the following page:
> https://answers.launchpad.net/ubuntu/+question/672395
>
> You received this question notification because you asked the question.
>

Revision history for this message
Best actionparsnip (andrew-woodhead666) said : 		#4

Uninstall the proprietary video driver then reboot. You can then reinstall the driver in the new release. It is rare for the proprietary video driver to survive a distribution upgrade in my experience

Revision history for this message
Vanamali (vanamalishastry) said : 		#5

Thanks actionparsnip, that solved my question.

Revision history for this message
Vanamali (vanamalishastry) said : 		#6

Thank you very much. I removed the nvidia-340 driver and rebooted the system. This time booted fine will use for some time, boot-reboot a few times to see what happens. For now the problem is solved. Thank you very much.

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Cody Kamstra (ozone-goggles) said : 		#7

My scenario is similar to what Vanimali described, however, I didn't fix the errors with libgcc1 and libpt 2.x.

I'm able to log in to root to enter commands, but not sure what I should be working on.

Ubuntu 16.04 HP Pavilion 17-e116dx