lemurs leaves the session a stdout nobody reads, so a program writing to it dies of EPIPE.
i3lock-color provides i3lock, so with it still installed the host saw i3lock as present,
skipped the install and then removed the only locker; removing it first lets the same
apply install i3lock.
The distribution's i3lock behind a locker that releases xss-lock's sleep lock
once it is up; timeouts and xss-lock from the session's xinitrc slot, ending
with the session; i3lock-color and xscreensaver declared absent; Go tools lock,
idle, inhibit and locked.
jochen