What version of Ubuntu are you using? And how did you get that minimal install? How did you install Firefox?
If you used this command
Code:
sudo apt install firefox
then Firefox was installed from the Ubuntu repositories and would be updated with the usual apt update and apt upgrade commands. That version of Firefox would be packaged in the Debian package format (deb)
There is another package format that is used by Ubuntu it is called "snap" packaging. To update a snap packaged application on a Ubuntu command line installation we run
That will refresh (update/upgrade) all snap packaged applications on the system. To only update the Firefox snap packaged application we run
Code:
sudo snap refresh firefox
To find out what Firefox package type you have open Firefox settings and scroll down to Firefox Updates it will tell if Firefox is a deb or snap package.
Regards
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