On bookworm, with xscreensaver 6.06+dfsg1-3 I had an error trying to do systemctl --user enable xscreensaver Failed to enable unit: Cannot alias xscreensaver.service as org.jwz.xscreensaver.
so did: cp /usr/lib/systemd/user/xscreensaver.service ~/.config/systemd/user/ (note that the man page says to use /usr/share/xscreensaver/xscreensaver.service which does not exist as the source) Then edited the user copy to edit out Alias=org.jwz.xscreensaver and now $ systemctl --user enable xscreensaver seems to work John
