Sorry for the late reply on this issue. I only saw it a few days ago.
I've spoken with the Arctica greeter developer and we've been working on
a fix.
The issue is this, Arctica Greeter requires a window manager and it
invokes Marco, the window manager from MATE Desktop. Marco handles
keybindings and by default has a number predefined. Ubuntu MATE adds a
few more. This is why you are able to invoke applications bound to
keybindings in Marco from Arctica Greeter.
The proposed solution is to add a patch to Marco so that it can be
invoked with keybindings disabled and then patch Arctica Greeter to
invoke Marco with the argument to disable its keybindings.
I will start preparing patched versions of Marco and Artica Greeter in a
PPA for testing/validation.
** Changed in: arctica-greeter (Ubuntu)
Status: New => Triaged
** Changed in: lightdm (Ubuntu)
Status: New => Invalid
** Changed in: mate-settings-daemon (Ubuntu)
Status: New => Invalid
** Also affects: marco (Ubuntu)
Importance: Undecided
Status: New
** Changed in: marco (Ubuntu)
Status: New => Triaged
** Changed in: arctica-greeter (Ubuntu)
Importance: Undecided => Critical
** Changed in: arctica-greeter (Ubuntu)
Assignee: (unassigned) => Martin Wimpress (flexiondotorg)
** Changed in: marco (Ubuntu)
Importance: Undecided => Critical
** Changed in: marco (Ubuntu)
Assignee: (unassigned) => Martin Wimpress (flexiondotorg)
** No longer affects: ubuntu-mate
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https://bugs.launchpad.net/bugs/1948339
Title:
Logon screen can be bypassed using various shortcuts
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