This similar bug says to use toram boot paramater, but if installer offers to unmount partition, it still should do that.
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/684280 Post #14 by experimancer Fix is actully here: https://help.ubuntu.com/community/Grub2/ISOBoot (i.e add "toram" to relevant Grub2 menuentry or manually umount the /isodevice with "sudo umount -lrf /isodevice" and re-start the installation. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1155216 Title: Unable to umount isodevice To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1155216/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
