[Bug 1510356] Re: Cannot upgrade to Ubuntu 15.10 (Installer Exits)

[Radu Manolescu]

/usr/lib/ubuntu-release-upgrader/check-new-release-gtk
Error executing command as another user: Not authorized

sudo /usr/lib/ubuntu-release-upgrader/check-new-release-gtk
This worked.

/var/log/dist-upgrade
The files in this directory are months old - no trace of the most recent failures.

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https://bugs.launchpad.net/bugs/1510356

Title:
  Cannot upgrade to Ubuntu 15.10 (Installer Exits)

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  Currently running Ubuntu 15.04. I run the Software Updater and it says
  "system up to date, but there is an update to 15.10". I click Upgrade,
  and nothing happens. I have looked in the various logs suggested by
  other posts (syslog, dpkg.log, /varlog/apt/*.log, etc - but I cannot
  find any error messages. How can I troubleshoot this?

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