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I decided to upgrade from 12.04 LTS to 14.04 LTS. I used do-release-upgrade. Everything worked.

When I run lsb_release -a I get :

Description : Ubuntu 14.04.1 LTS
Release :     14.04
Codename :    trusty

I think at this moment, the upgrade is a success. But, I have these problems :

  1. There's a loop when I try to login to my desktop session. cat ~/.xsession-errors gave me :

    Unable to get name "org.gnome.zeitgeist.datahub" on the bus!

    On LightDM I still see Ubuntu 12.04 LTS

  2. I cannot install anything that could help me solve the problem above. When I run apt-get -f install I get :

    ...
The following extra packages will be installed:
  ubuntu-release-upgrader-core
The following NEW packages will be installed:
  ubuntu-release-upgrader-core
...
E: Could not open file descriptor -1
...
E: Sub-process /usr/bin/dpkg returned an error code (1)

When I try apt-get upgrade, it asks me at the end to run apt-get -f install.

(How) can this be fixed?

Update

To resolve the second issue, I proceeded this way : mv /etc/update-manager/release-upgrade /etc/update-manager/release-upgrade.back then dpkg -i --force-overwrite ubuntu-release-upgrader-core*.deb . At last, apt-get -f install worked. Now the challenge will be the desktop access.

Anwar
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Ulysses PenSalami
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  • To resolve the seond issue, I proceeded this way : mv /etc/update-manager/release-upgrade /etc/update-manager/release-upgrade.back then dpkg -i --force-overwrite ubuntu-release-upgrader-core*.deb . At last, apt-get -f install worked. Now the challenge will be the desktop access. – Ulysses PenSalami Aug 23 '14 at 21:36

1 Answers1

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To resolve the second issue, I proceeded this way : 

sudo mv /etc/update-manager/release-upgrade{,.back}
sudo dpkg -i --force-overwrite ubuntu-release-upgrader-core*.deb

At last, sudo apt-get -f install worked.

I ran

sudo apt-get update && sudo apt-get upgrade

After reboot, to solve the problem Failed To Start Session. I followed the first part of the solution proposed here ItsFOSS. 

sudo apt-get install --reinstall ubuntu-desktop

The next step was a problem with Unity not properly loading. This topic was already discussed here: Unity doesn't load, no Launcher, no Dash appears

Finally I uninstalled Unity and installed Gnome Shell.

sudo apt-get install gnome-shell ubuntu-gnome-desktop
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Ulysses PenSalami
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