According to the log an error it's trying to install the efi on /dev/sda which sounds wrong. Did you do an automatic partioning?
** Summary changed: - Ubiquity 21.04.19 ends in 'error install grub' but Ubuntu get installed + error: Running 'grub-install --force --target x86_64-efi "/dev/sda"' failed. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1925187 Title: error: Running 'grub-install --force --target x86_64-efi "/dev/sda"' failed. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1925187/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
