I had the same error as #5 installing Ubuntu 18.04 I ended up finding a solution from an SO post from 2015 (!)
https://askubuntu.com/questions/502307/the-attempt-to-mount-a-file- system-with-type-vfat-in-ssi10-0-0-partition1sda mkfs.vfat /dev/sdb1 worked for me to format the EFI partition and the installer worked when I rebooted and tried it again -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1423830 Title: Ubiquity hangs if the ESP can not be mounted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1423830/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
