This laptop is a real pain. Firstly, it was really difficult to configure the BIOS setting to allow booting from CD/DVD drive or from my USB pendrive. Just setting the boot order was not enough. I had to create a booting password so that I could set the "secure boot" functionality off and then I had to enable some kind of non-obvious legacy BIOS setting option and then I could finally boot. Secondly, the booting just wouldn't finish. I tried to boot from a live CD and from by pendrive but the boot just hanged and wouldn't finish.
I can stand for Trisquel 5.5 being incompatible since it can be improved over time, but the fact that the BIOS manufacturer obviously makes it hard for me even to try to boot makes me angry. For now, avoid this laptop.