I have a default install of 18.04 desktop. I've installed i3, which succeeded, including creating /usr/share/xsessions/i3.desktop as in How do you add a new window manager to the gdm menu?

On the gdm login screen, there is no gear or similar to change window managers.

Help! thank you!


You need to perform a full reboot, or at least restart gdm, to update the list of sessions, and thus also see your new i3 session. In GDM, the cog icon to select your session is available after having selected your name.

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    Even after following this, I can't see i3 in the list. It seems installing i3 did not put anything under /usr/share/xsessions – cafebabe1991 Mar 30 at 17:10

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