This bug was fixed in the package tmux - 3.0a-2ubuntu0.3
--------------- tmux (3.0a-2ubuntu0.3) focal; urgency=medium
* Fix "tmux sessions do not show up with who, users, etc" (LP: #1890406) - d/p/add-utempter-code.patch: Cherry-pick commit 54efe33 from upstream to add back utempter code to avoid users in tmux sessions not being accounted by the system.
-- Athos Ribeiro <email address hidden> Thu, 22 Apr 2021 16:39:18 -0300
This bug was fixed in the package tmux - 3.0a-2ubuntu0.3
---------------
tmux (3.0a-2ubuntu0.3) focal; urgency=medium
* Fix "tmux sessions do not show up with who, users, etc" (LP: #1890406) utempter- code.patch:
- d/p/add-
Cherry-pick commit 54efe33 from upstream to add back utempter code to
avoid users in tmux sessions not being accounted by the system.
-- Athos Ribeiro <email address hidden> Thu, 22 Apr 2021 16:39:18 -0300