Thanks for this. Removing the “quiet” made the boot process more transparent (ie more verbose). However, I still struggle to login. I entered the disk encryption password (I also tried a US-keyboard version just because) and then tried Ctrl-Alt-F2 and Ctlr-Alt-FN-F2. Still no luck.
As for the post-install script, try this: 4.3: No templates installed; "Templates Configuration" screen never appeared - #2 by DVM
[edit: not sure why this post appeared twice]