Thank you for using Ubuntu and reporting a bug.
The steps clearly demonstrate this issue, but this is by design and not
easily fixed. This is no different than if you log into your system,
then do Ctrl+Alt+F1 to go to the console, and then Ctrl+Alt+F7 to get
back to your session. In this case the screensaver is not started when
going to the console so when you come back it is not started. It is the
kernel that is catching the keypresses and changing to the various
virtual consoles, not your X session. This could be fixed by having the
kernel emit some sort of an event that userspace could process, but this
wouldn't fix the general case of switching between tty1 and tty2. It is
best practice to logout of the virtual consoles (including the one's
that X is running on) before stepping away from your computer.
Alternatively, instead of using 'Ctrl+Alt+F8' to go back to the second
user, you can simply use the 'switch user' functionality that was used
in step 2.
Marking Wishlist and "Won't Fix" because we will not fix this in Ubuntu.
** Changed in: gnome-screensaver (Ubuntu)
Importance: Undecided => Wishlist
** Changed in: gnome-screensaver (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/835147
Title:
User switching can be used to hijack a desktop user and steal
passwords
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