I'm attempting to upgrade to 19.10 from the 18.04 LTS but have encountered some blockages. I followed the instruction to change the line in release-upgrades then on trying got a message in the console that "Upgrades to the development release are only available from the latest supported release."
I then used the upgrade-manager (Alt F2), followed the instructions and got upgraded to 19.04. However a second attempt with the result shown in this image, confirmed that there is a 19.10 upgrade but I have no luck installing it. Photo
Attempts via the terminal:
"mark@mark:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 19.04
Release: 19.04
Codename: disco
mark@mark:~$ sudo do-release-upgrade -d
[sudo] password for mark:
Checking for a new Ubuntu release
Upgrades to the development release are only
available from the latest supported release."
I'd appreciate any help in getting over this hump.
Thanks.
The problem was solved by using apt update rather than apt-get update. Apt showed that a Calf-plugin package needed to be upgraded. Apt-get did not show that information. Installing the calf-plugin update solved the problem.