Downgrade Thunderbird 6 to Thunderbird 5 from PPA

[Alan Pope]

On 18 August 2011 14:13, Dotan Cohen <dotancohen at gmail.com> wrote:
> Now Thunderbird was upgraded to version 6 and broke an essential
> extension. I found a Thunderbird 5 deb from here:
> https://launchpad.net/ubuntu/oneiric/i386/thunderbird/5.0+build1+nobinonly-0ubuntu5
>

What release of Ubuntu are you on? That deb is from 11.10 which hasn't
been released yet, so I would avoid it if you're on 11.04 or below.

Have you contacted the author of the extension to see if they are
planning to update it?

> However removing the installed Thunderbird is giving me all kinds of
> dependency issues, such as Enigmail. How does one "roll back" to a
> previous version via aptitude? I tried using Synaptic's Fore Version
> feature, but it is disabled on Thunderbird. Maybe that is due to the
> PPA?
>

I would first disable the PPA, then "apt-get autoremove" thunderbird.
It would probably be easier to then grab the version 5 release from
Mozilla upstream and run that until the extension you need is updated.
I'm not sure if you can suppress the update mechanism easily in 5 to
prevent going to 6 for now. If you can find a deb for your release of
Ubuntu then you could use that and "pin" it to prevent it updating.

Al.