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XMC Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

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TitleXMC Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
Symptoms
Following an upgrade using the BIN image, upon reboot the system may fail to start and display the following kernel panic:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
Environment
  • Extreme Management Center (XMC, formerly NetSight)
  • Extreme Control (formerly NAC)
  • Extreme Analytics (formerly purview)
  • All 8.2.x Software Releases
  • All 8.3.x Software Releases
  • Ubuntu 14.04 LTS / ESM
  • Ubuntu 16.04 LTS
  • Ubuntu 18.04 LTS
Cause
One or more kernel boot files are corrupt or not present in the /boot partition.

It is likely the /boot partition is at or near capacity OR the /boot partition was at or near capacity the last time the system was upgraded using the BIN image.
Resolution
The GRUB boot loader can be entered by holding SHIFT or ESC during system startup. Once the GRUB loader has started, select an alternative kernel than the default / most recent kernel installed. This should allow the system to boot.

In general the recovery procedure is the same. Space must be freed in the /boot partition by removing older / broken / obsolete kernel packages but the procedures may vary depending on current deployment.

Once the system has logged in via the alternative kernel, capture and provide the output of the following commands, and open a GTAC support case:
uname -a
mount
df -h
dpkg -l
ls -al /boot
ls -al /boot/grub
cat /boot/grub/grub.cfg
cat /etc/default/grub
apt-get install (select NO if/when prompted)
Additional notes
During the BIN upgrade process or during a manual kernel upgrade attempt the following output will likely be captured (* kernel version numbers will vary):
gzip: stdout: No space left on device
E: mkinitramfs failure find 141 cpio 141 gzip 1
update-initramfs: failed for /boot/initrd.img-4.4.0-154-generic with 1.
run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
dpkg: error processing package linux-image-4.4.0-154-generic (--configure):
 subprocess installed post-installation script returned error exit status 1
E: Sub-process /usr/bin/dpkg returned an error code (1)

 

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