I checked /etc/update-manager/release-upgrades and it should accept LTS upgrades
sudo apt dist-upgrade Reading package lists... DoneBuilding dependency tree... DoneReading state information... DoneCalculating upgrade... Done0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.andre@ODIN:~$ sudo do-release-upgrade Checking for a new Ubuntu releaseThere is no development version of an LTS available.To upgrade to the latest non-LTS development release I did update/upgrade, and --fix-broken install