This was reported on the forums too:
http://ubuntuforums.org/showthread.php?t=2215103 where directhex2
mentioned:
I've tracked down the problem to a change in debian-installer-utils 1.98
Looking at the changelog
(https://launchpad.net/ubuntu/saucy/+source/debian-installer-utils/+changelog)
I see:
[ Joey Hess ]
* fetch-url: Try to mountmedia when getting a file, to support preseed
via USB from netboot.
That change adds a call to mountmedia
(http://anonscm.debian.org/cgit/d-i/debian-installer-
utils.git/commit/?id=916a613577c5cd747d15b3d20f16b9518d7d54ea)
That code will list the disk partitions (http://bazaar.launchpad.net
/~ubuntu-
branches/ubuntu/wily/mountmedia/wily/view/head:/mountmedia#L24).
In my case that finds /dev/sda1 (my existing HD boot partition) and mounts that
as /media.
My CD is on /dev/sr0 is mounted as /cdrom. I have no other media I need to have
mounted.
The forum suggested a workaround: unmount /media in an early preseed command.
You want to ignore failures when you run on a system where /media does not get
mounted (blank HD).
This worked for me:
d-i preseed/early_command string umount /media || true
What is the right fix here? I can't imagine how mountmedia picking a HD
partition on the target disk and mounting it makes a lot of sense in the
overwhelming majority of cases. Should it not be doing that? Should
debian-installer-utils not use mountmedia? Should there be an installer
option to skip it? Are there any better ways to avoid this?
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https://bugs.launchpad.net/bugs/1347726
Title:
ubuntu14.04 installation hang on "The installer has detected that the
following disks have mounted partitions"
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