[Trisquel-users] Re : Trisquel 8 codename "Flidas" Release Candidate is ready for testing

[lcerf]

'ppa-purge', in Trisquel's repository, is supposed to ease what you have just  
done.  The PPA must still be enabled to "purge" it.  It can then be removed  
and the packages it provides can be erased (one can use the "Origin" button  
of the "Synaptic Package Manager").

I was in the exact same situation: with several versions of gcc/g++ installed  
from a PPA, the same as you I believe.  I realized it could be problematic  
for the upgrade to Trisquel 8.  After a backup of the user data, I therefore  
did what I have just written in the paragraph above.  It apparently all went  
well: I shut the system down.  The day after was supposed to be the day I  
would *upgrade* to Trisquel 8... but, for some reason, Trisquel 7 did not  
start: a black screen with not even an access to a text session.  I did a  
fresh install...