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
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.