do-release-upgrade 15.10 -> 16.04 failed due to squid3 and unity

[Marius Gedminas]

I've a laptop running Ubuntu GNOME that also acts as my home server. It's always on, runs things like a local squid-deb-proxy, and it's connected to my TV for entertainment (hence GNOME).

I was trying to upgrade it from 15.10 to 16.04 with do-release-upgrade over ssh, and it failed in the middle:

    Errors were encountered while processing:
     squid3
     unity

    Upgrade complete

    The upgrade has completed but there were errors during the upgrade
    process.

I'm now recovering with 'apt dist-upgrade -f --auto-remove', and I hope that ubuntu-bug attached the relevant log files from /var/log/dist-upgrade/ to make this bug report useful.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.12
ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CrashDB: ubuntu
Date: Sat Apr 23 10:41:59 2016
InstallationDate: Installed on 2012-11-02 (1267 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
PackageArchitecture: all
ProcEnviron:
 LC_CTYPE=lt_LT.UTF-8
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2016-04-23 (0 days ago)

[Brian Murray (brian-murray)]

It actually looks like it may be an issue with dpkg:

Removing obsolete conffile /etc/squid3/msntauth.conf ...
initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
insserv: warning: script 'screen-cleanup' missing LSB tags and overrides
insserv: Default-Start undefined, assuming empty start runlevel(s) for script `screen-cleanup'
insserv: Default-Stop undefined, assuming empty stop runlevel(s) for script `screen-cleanup'
Skipping profile in /etc/apparmor.d/disable: usr.sbin.squid
Removing obsolete conffile /etc/init.d/squid3 ...
Removing obsolete conffile /etc/init/squid3.conf ...
Processing triggers for systemd (229-4ubuntu4) ...
dpkg: dependency problems prevent processing triggers for ufw:
 ufw depends on ucf; however:
  Package ucf is not configured yet.
 ufw depends on python3; however:
  Package python3 is not configured yet.
 ufw depends on python3:any (>= 3.3.2-2~); however:
  Package python3 is not configured yet.

dpkg: error processing archive /var/cache/apt/archives/squid3_3.5.12-1ubuntu7_all.deb (--unpack):
 dependency problems - leaving triggers unprocessed

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Marius Gedminas (mgedmin)]

Could be a duplicate of bug 1571174.