@GNUser thank you for your help!
I just tried to upgrade my computer to Trisquel 8 and got the following
error:
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Trisquel
* Running the current pre-release version of Trisquel
* Unofficial software packages not provided by Trisquel
If none of this applies, then please report this bug using the command
https://trisquel.info/en/project/issues in a browser..
Any ideas???