Hi, thank you for your response.
Yes, it is a thumb drive, I tried 3 different drives from various sizes. I created the drive with dd and etcher without success. I tried different block sizes (512k, 8192k, 4M, etc) and nothing. The thing is, the drive boots in legacy mode, but not in uefi.
Then I tried 18.05 with dd and boots just fine in uefi. I tried ubuntu and boots too.
To be honest I don’t know what I am doing wrong. I checked the image, the drives, etc and everything is fine. It seems there is a problem with that image i guess. Maybe i’ll try other desktops images later, but for now, it seems that the kde image is broken for uefi.
Regarding 18.05, i’m using sabayonlinux.org repo and not sabayon-weekly and I get this message trying to update:
Source Package Manager is too old, please update it: UnsupportedAPIException()
I tried upgrading entropy/portage/equo/rigo with --nodeps (because, if I try without it, it tries to install everyting and then fails with the same error). Once installed, equo stops working. I think it fails because it tries to use python3.7 and it is not installed, but i don’t know what dependencies python3.7 uses, so i just reinstalled everything but i’m stuck with that error.
Sorry for the long response, i tried to be concise.