Sorry, It is an ubuntu-session bug, not gnome-session's. I can't find the "delete" button.
I've opened a new bug here: https://bugs.launchpad.net/ubuntu/+source /ubuntu-session/+bug/1768856 ** Changed in: gnome-session (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-session in Ubuntu. https://bugs.launchpad.net/bugs/1768854 Title: ubuntu-session incompatible with extension "window list" Status in gnome-session package in Ubuntu: Invalid Bug description: Ubuntu 18.04 (also tested in 17.10) ubuntu-session: Installed: 3.28.1-0ubuntu2 Candidate: 3.28.1-0ubuntu2 Version table: *** 3.28.1-0ubuntu2 500 500 http://es.archive.ubuntu.com/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status gnome-shell-extensions: Installed: 3.28.0-2 Candidate: 3.28.0-2 Version table: *** 3.28.0-2 500 500 http://es.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages 500 http://es.archive.ubuntu.com/ubuntu bionic/universe i386 Packages 100 /var/lib/dpkg/status gnome-session: Installed: 3.28.1-0ubuntu2 Candidate: 3.28.1-0ubuntu2 Version table: *** 3.28.1-0ubuntu2 500 500 http://es.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages 100 /var/lib/dpkg/status Gnome extension "Window List" (https://extensions.gnome.org/extension/602/window-list/) installed via apt (gnome-shell-extensions package) fails to load when logged using ubuntu-session. When using Ubuntu / Communitheme https://dl.sai.ma/s/X5CPKfnZspQx66W https://dl.sai.ma/s/yxtD3bgtBfpcoJR But when using Gnome / Gnome on Xorg https://dl.sai.ma/s/kmfyTffmXK8SNGj https://dl.sai.ma/s/77ZnBkaGoj6PX3f To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/1768854/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp