Okay, I guess that makes sense. Prompt=lts would prevent upgrade from 18.04 to 18.10, 19.04, and 19.10. When 20.04 comes out, Prompt=lts would then hopefully allow upgrade to the development version with -d. I'll see what the update-manager team comes up with on this one.
In the meantime, can we change the comments in the /etc/update-manager/release-upgrades file to note this behaviour? Right now, it only describes the impact on whether the user is prompted to upgrade. It should also describe that it controls whether you will be able to perform the upgrades.
Okay, I guess that makes sense. Prompt=lts would prevent upgrade from 18.04 to 18.10, 19.04, and 19.10. When 20.04 comes out, Prompt=lts would then hopefully allow upgrade to the development version with -d. I'll see what the update-manager team comes up with on this one.
In the meantime, can we change the comments in the /etc/update- manager/ release- upgrades file to note this behaviour? Right now, it only describes the impact on whether the user is prompted to upgrade. It should also describe that it controls whether you will be able to perform the upgrades.