I was running into the same issue and finally by luck happened upon a set of slides that allowed me to automate this and there was an accompanying code repository with the full preseed file. https://github.com/uweplonus/adia- install/blob/master/initrd/preseed.cfg#L3
Many people suggest using `preseed/early_command umount /media/*` but this hasn't worked for quite some time due to the timing of when the preseed portion runs compared to the partitioning. The correct way to do this is to add the following anywhere in your preseed file that is referenced by the boot command. ```d-i partman/early_command string \ USBDEV=$(list-devices usb-partition | sed "s/\(.*\)./\1/");\ BOOTDEV=$(list-devices disk | grep -v "$USBDEV" | head -1);\ debconf-set partman-auto/disk $BOOTDEV;\ debconf-set grub-installer/bootdev $BOOTDEV; \ umount /media; ``` -- 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
