Looks like a corrupted support used. Lot of "Error retrieving chunk extents: Operation not supported" logged.
First check the iso's md5sum, then how that iso has been burnt (maybe too quickly). http://releases.ubuntu.com/18.04/ https://help.ubuntu.com/community/BurningIsoHowto Indeed, if you can use an usb stick for installation, its a better solution. https://www.makeuseof.com/tag/install-ubuntu-computer-using-usb-flash-drive/ ** Changed in: grub-installer (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1770912 Title: grub installation fetal error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1770912/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
