Hi, and welcome back to the community !
You can set this with:
-
A GUI, using
dconf-editor
Assuming you're using Ubuntu MATE 20.10, it's located in
org.ayatana.indicator.datetime
. Just setshow-week-numbers
totrue
instead of thedefault value
that isfalse
.
Should you be using Ubuntu MATE 20.04 LTS, it would be located in
com.canonical.indicator.datetime
. -
A terminal
with
gsettings set org.ayatana.indicator.datetime show-week-numbers true
if you're using Ubuntu MATE 20.10or
gsettings set com.canonical.indicator.datetime show-week-numbers true
if you're using Ubuntu MATE 20.04 LTS.