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I have tried the normal way (sudo apt update, sudo apt upgrade, etc etc), but it keeps trying to go to 22.04, which obviously doesn't work because 21.04 isn't a supported upgrade path. I really don't want to have to reinstall my OS, so any help is appreciated.

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    Note that freshly installing 22.04 might give you a cleaner system – Archisman Panigrahi Jul 18 '22 at 02:37
  • Ubuntu 21.04 has one supported & Quality-Assurance tested upgrade path; to the next release, which closed the moment Ubuntu 21.10 reached EOL on 14-July-2022. You can upgrade via re-install for desktop systems, but it's intended for Ubuntu repository software only & desktop apps only (system directories are erased thus some server app restoration maybe be required if using server setups) – guiverc Jul 18 '22 at 02:42
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    There hasn't been a supported upgrade path since your OS became EOL. Always release upgrade before the EOL date. Standard releases come out every 6 months. If you don't want to upgrade between 6-9 months, it's suggested to use a LTS release. – Nmath Jul 18 '22 at 02:53
  • FYI: if the bug report filed on a condition like this was you, the upgrade via re-install I mention is only tested with Ubuntu desktop installers; ie. calamares & ubiquity, and not server installer (subiquity) at least to my knowledge. Most server systems are managed & upgrades planned by owners/maintainers & thus its not an issue (commonly using LTS too so they have years to do it instead of mere months) – guiverc Jul 18 '22 at 03:03

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