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I installed some updates to Ubuntu Server 16.04 LTS Xenial today, and when my MacPro (Early 2008) rebooted, I was welcomed by a kernel panic and a message reading:

VFS: Unable to mount root fs on unknown-block (0,0)

I was then able to boot into GRUB2 and after selecting from the advanced options a few times, I was able to boot the machine again using the 4.4.0-53-generic version of the kernel.

Upon booting I received a crash report about the linux-firmware 1.157.6 package and that the error message was subprocess installed post-installation script returned error exit status 1

Is there some reason for this? Is there anything I should read or do to keep my machine working?

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Found out that two things were wrong:

  1. My /boot was 95% full and it could not continue with the upgrade.
  2. There was a PPA screwing it up, and I removed it from /etc/apt/sources.d/

After that I cleaned up my linux-images, and ran apt-get autoremove

It now seems to be working correctly again.

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