We have been making custom made initrd.gz generated through debian-installer for 10.04 and 12.04 ubuntu.

We have been partitioning the disk and have made it automated completely and ask user to answer only few questions.

The problem I am facing is as below:


You have mounted partition on /dev/sda

Would you like the installer to unmount it


In 14.04.1 ISO /dev/sda1 is mounted on to /media and doesn't get unmounted even if I use preseed/early_command string umount /media I have tried all options of umount –l –f

Due to this a user has one more question to answer.

Neither does partman/unmount_active boolean true work

Earlier in 12.04, It would not ask to unmount the disk as /dev/sda1 was never mounted to media.

Is there a solution to either unmount the disk or set the Boolean as true through preseed?


This seems to be bug 1347726 which has not yet been resolved.

So I guess the answer, as of mid 2016, is: No.

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