I upgraded my "acer aspire e13" laptop to lubuntu 17.10 (from 16.04, via 17.04) a few days ago and experience the following:
- when booting with power cable plugged in, everything works.
- whithout power cable, it doesn't start X11. Instead I can log in at the console. After logging in I get two or three messages about upgrade demon not being able to write a temporary file because the disk is mounted read only.
The battery is certainly fine, I can work for hours on it.
I don't even know where to start looking.
UPDATE - by request of Katu, here is the output of dmesg. I have still no clue.