When I booted from the Ubuntu live CD I got logged in to live-session. And from there I initiated the installer of Ubuntu.
While installation was going on, with my usual practise with ubuntu desktop I locked the screen and went away for my other work.
When I returned back to desktop and tried to access the live-session or installer the screen was locked and was asking me password for live session user, which I didn't knew.
Then I tried this workaround, I switched to terminal with Ctrl+Alt+F1... F2 whatever. and there I changed password for current user with passwd command.
And again came back to Ctrl+Alt+F7 and entered the password which I have reset.
So one thing I want to point out through this bug report is - users usually do not know password for live user and if they are in the middle of installation it is highly possible that in above mentioned scenario they will reset their system for locked screen and land into partially installed / corrupted ubuntu installation.
We need to disable the screen lock while ubuntu instalation is going on. But even if user presses Ctrl+Alt+L or something like Ctrl+Alt+Del then display message that these functionality are disabled for live session while installer is running.
Release I tried : Ubuntu 8.10,
There should not be any lock screen function in the live session (see also bug 276549). Anyway, the password is empty to just pressing Enter should work.
Is this still an issue in Ubuntu 9.04 or Karmic?