Same problem on Ubuntu 14.04.4 during a VM install on /dev/sda1 which is a /boot partition from previous install get automounted even with folllowing commands in the kickstart.
preseed partman/umount_active boolean true preseed preseed/early_command string umount /media || true -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1347726 Title: ubuntu14.04 installation hang on "The installer has detected that the following disks have mounted partitions" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/1347726/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
