Older discussions of essentially the same problem: https://bugs.launchpad.net/ubuntu/+source/unison/+bug/1568459 https://askubuntu.com/questions/1234767/can-i-install-unison-for-ubuntu-18-04-lts-on-ubuntu-20-04-lts https://bugs.launchpad.net/bugs/1875475
Apparently the unison-all package has been broken since at least Ubuntu 18.04.
Older discussions of essentially the same problem: /bugs.launchpad .net/ubuntu/ +source/ unison/ +bug/1568459 /askubuntu. com/questions/ 1234767/ can-i-install- unison- for-ubuntu- 18-04-lts- on-ubuntu- 20-04-lts /bugs.launchpad .net/bugs/ 1875475
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Apparently the unison-all package has been broken since at least Ubuntu 18.04.