[Trisquel-users] Re : Upgrade failed: Trisquel 7 to Trisquel 8

[lcerf]

You could remove "trisquel-desktop-common-recommended", which does not  
install anything by itself (it is a meta-package) and try again.

That said, the easy solution is to backup your user data, maybe your list of  
packages (  
https://trisquel.info/en/wiki/cloning-system-or-how-make-copy-installed-packages-one-computer-another  
) and to do a clean install.  If you have /home separated from /, you can  
choose the "Something else" type of install, specify the existing filesystem  
to be mounted at /home and that it must *not* be formatted.  You can also  
specify an existing swap partition.  Once the new system installed, you can  
reinstall your list of additional packages (although there may be some  
problems: some packages may have been removed from the repository, etc.).