Public bug reported:

I tried to upgrade from an up-to-date and working Ubuntu 14.04 to 16.04
using do-release-upgrade.  The process seemed to complete successfully
except for a couple of errors regarding fcitx packages, which I choose
to ignore and fix later.

I then proceeded to reboot, but the system hanged during the shutdown so
I decided to hard reboot.

However, I was greeted by a kernel panic preceded by straightforward
error messages :

run-init: /sbin/init: No such file or directory
Target filesystem doesn't have requested /sbin/init.
run-init: /sbin/init: No such file or directory
run-init: /etc/init: Permission denied
run-init: /bin/init: No such file or directory
/bin/sh: 0: Can't open splash
Kernel panic — not syncing: Attempted to kill init! exitcode=0x00007f00
etc. (last two lines mentioned for SEO purposes)

Indeed, these files don't exist.  It seems /var/log/apt/history.log
doesn't log "do-release-upgrade", so I have no clue about what went
wrong during the upgrade.

FWIW, I can keep the laptop in this state for a couple of days and check
or try whatever is proposed (though I'd rather avoid involving a live CD
or similar).

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1652462

Title:
  No init after do-release-upgrade from 14.04 to 16.04 (kernel panic)

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