No flidas in source.list... So I used do-release-upgrade command.. and I obtained same error.
Calculating the changes

Calculating the changes

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 in a browser..

I got this error message too and I replied YES to question.
Updating repository information

No valid mirror found

While scanning your repository information no mirror entry for the
upgrade was found. This can happen if you run an internal mirror or
if the mirror information is out of date.

Do you want to rewrite your 'sources.list' file anyway? If you choose
'Yes' here it will update all 'belenos' to 'flidas' entries.
If you select 'No' the upgrade will cancel.

Thank you

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