I received a Librem13 last week-end by François Téchené (François lend me his own machine, I only put on it a blank 250GB SSD so François could keep his datas ). I installed on it PureOS from the ISO, using a USB stick.
The screen lock of the GNOME live session activated itself during the installation process, at the moment the media copy all the files on disk. To unlock the screen, I was prompted for a password.
What I tried
I tried random one: "password" was my first idea, I also tested "admin", leaving the field blank and "pass"... But no attempt were accepted.
What I was expecting
I wasn't expecting to get blocked by the screenlock in a live session. Maybe the default timer to trigger the screenlock is too low?
Workaround I found
I thought I had to perform a hard reboot and restart the live install from scratch. I wasn't happy to have to do it while the file were copying in background, because it was a possible waste of time (to redo the install) and also I wasn't sure to not damage the computer (eg. I don't imagine what hard reboot can do during install of the bootloader). Fortunately after a quick search on internet about Debian-testing, I had the information:
Default password: live
... It unlocked the screen and I could finish the installation process...