It sounds like a BIOS bug and your logs show you are using version: BIOS F.40 05/17/2018
which is now out of date. To try and fix this you will need to reinstall Windows (sorry), and then install the new BIOS version F.52 from: https://ftp.hp.com/pub/softpaq/sp95001-95500/sp95307.exe (found via https://support.hp.com/au-en/drivers/selfservice/hp-250-g6 -notebook-pc/15747807) ** No longer affects: casper (Ubuntu) ** No longer affects: grub-installer (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1835664 Title: I can not install any Ubuntu distros in the UEFI mode (but BIOS- compability mode works without efforts): "Unable to install GRUB in /dev/sda" To manage notifications about this bug go to: https://bugs.launchpad.net/elementaryos/+bug/1835664/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
