So I went to check for some updates using the Software Updater and it tells me that my current version (19.04) can no longer receive updates and therefore I need to upgrade to 20.04.1. So I update it, plug in my password, and after a few seconds it tells me that "upgrade from disco to focal is not supported with this tool"
When you originally installed Ubuntu 19.04, the download page offered you two choices: 18.04 LTS and 19.04.
- Both choices were clearly explained, including that 19.04 was supported for only nine months.
- On an unmodified, stock Ubuntu system, the Update Notifier applet nags the user to release-upgrade when the next release of Ubuntu becomes available. Some folks do not remember disabling (or haywiring around) this useful feature. Update Notifier is well tested in every supported release of Ubuntu -- it works.
Upgrades from 19.04 to 19.10 were available October 2019 - January 2020. Folks who use Standard (non-LTS) releases of Ubuntu mark their calendars every April and October.
- You waited too long: We do not provide support for release-upgrading from one EOL release of Ubuntu to another EOL release of Ubuntu.
- The only supported method available to you is to back up your data and clean-install a supported release of Ubuntu.
- You can do anything unsupported that you wish; it's your system. But we obviously won't provide support for it.