Looks like tmux set an unsupported terminal emulation [root@test ~]# mc Error opening terminal: tmux-256color. [root@test ~]#
> https://git.ipfire.org/?p=ipfire-2.x.git;a=commitdiff;h=901f6b7c292da9829a7ff4cf04caad48128bf87e
https://blog.ipfire.org/post/ipfire-2-27-core-update-170-is-available-for-testing
https://blog.ipfire.org/post/ipfire-2-27-core-update-170-released