I am upgrading from 18.04 to 20.04.1 using the sudo do-release-upgrade command.

At some point I got the following message:

Could not calculate the upgrade 

An unresolvable problem occurred while calculating the upgrade. 

This was likely caused by: 
* Unofficial software packages not provided by Ubuntu 
Please use the tool 'ppa-purge' from the ppa-purge 
package to remove software from a Launchpad PPA and 
try the upgrade again. 

The tool, ppa-purge requires to provide specific ppaname or ppaowner as input.

How do I know which PPA is actually causing the upgrade issues?

  • 1
    I recommend that you remove all but official sources and reinstall any unofficial sources after a successful upgrade
    – Nmath
    Oct 8 '20 at 19:55
  • 1
    Open up Software and Updates and all PPAs you added will be under other software tab. Uncheck all and reload, need password.
    – crip659
    Oct 8 '20 at 20:09
  • Meant uncheck all the PPAs, leave the others alone.
    – crip659
    Oct 8 '20 at 20:16
  • Start synaptic (install it if you need to), and click the RELOAD button. The error(s) that appear are the problem. Show me the errors (copy/paste into your question) and I can try to help.
    – heynnema
    Oct 8 '20 at 20:50
  • @heynnema Thanks, I already followed the previous advice and disabled all PPAs from the update manager GUI. I have now an unresolvable error with no explanation at all, but this is probably a material for a different question.
    – Artium
    Oct 8 '20 at 23:09

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