We faced a known issue that would not allow us to continue with the upgrade. You will see the following error message: Here are 2 solutions available to resolve this issue. It may be one solution not worked in some situations, try another solution.
Solution 1:
The first solution is to disable all third-party repositories in your system. Use the below given commands to disable all repositories: Then clean the Apt update state cache data: Now, again start the Ubuntu upgrade process. In case the above solution doesn’t now, follow the second solution.
Solution 2:
First of all clean all the Ubuntu upgrade state cache with the following commands. Now, execute the following commands one by one. Finally, run the Ubuntu upgrade process again. Hopefully, this will resolve the issue If any of the above solutions resolved your issue, kindly share this tutorial. For any issues or other solutions please comment below.