This are a collection of fixes and tweaks I used to get Xubuntu 18.04 LTS working on a lenovo thinkpad X380 yoga laptop.
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Bios:
- First UPDATE IT, since some old bioses may cause bricking when settings are changed. I used 1.22 and it was fine, but it's no garuntee for others.
- you can use linux or the preinstalled windows to update the bios http://positon.org/lenovo-thinkpad-bios-update-with-linux-and-usb
- put into legacy mode (not UEFI) before install, to allow undervolting (to save power and heat)
- 'Security -> Secure Boot - Set to "Disabled"'
- (optional) turn off hyperthreading if you want to save more power
- First UPDATE IT, since some old bioses may cause bricking when settings are changed. I used 1.22 and it was fine, but it's no garuntee for others.
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(optional) find the settings for cpu power management and switch to power saving or balanced mode on battery (if not already)