[Bug 1511875] Re: Can't upgrade from 15.10 Wily to 16.04 Xenial in LXC container

[oleg]

I encountered a similar problem when upgrading a container from 13.04 to
13.10.

The problem was that the listed dependencies for ubuntu-release-
upgrader-core were not sufficient.

The solution was to install python-apt.  (Even that was a bit difficult;
I had to manually create an empty file,
/etc/python2.7/sitecustomize.py).

If python-apt doesn't solve the problem, then you could try searching
for other missing dependencies.  Here's one way to do that:

(1) List the reverse-dependencies of ubuntu-release-upgrader-core:

apt-cache rdepends ubuntu-release-upgrader-core

On ubuntu-14.04 the reverse-dependencies include update-manager-core.

(2)  List the dependencies of update-manager-core,

apt-cache depends update-manager-core

Try installing some or all of these dependencies and see whether it
solves the problem.

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https://bugs.launchpad.net/bugs/1511875

Title:
  Can't upgrade from 15.10 Wily to 16.04 Xenial in LXC container

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