>Ok so, this problem seems to be caused by running ubiquity within a
>liveboot that was booted from an iso file on the hdd (in my case I used
>grub2's loopback interface). It would seem that the migration assistant
>wanted to access other files on the partition that had the iso on it and
>refused to run without unmounting the partition, which I assumed
>wouldn't be good for the live system.

>Simply calling ubiquity using "ubiquity --no-migration-assistant" from
>the command line instead of the shortcut on the live desktop prevented
>the migration assistant from complaining.

>It would be nice if ubiquity could tell that the liveboot came from an
>iso file that is still mounted, (ie check if the /isodevice (created I
>assume by grub2) mount folder exists and offer to not run the migration
>assistant, either at all or give a warning and then use the assistant on
>the other partitions that it can access.

> ALL IN ALL THIS ISN'T REALLY A BUG!

I disagree. the fact that you can explain exactly how "properly
behaving" programs end up doing something unexpected when combined, does
not mean that it isn't a bug.

In this case, "it crashes" is definitively unwanted behavior, and
whatever-it-takes should be done to prevent the end user getting
confronted with this situation.  (several decades ago, there was this
daemon that would send "you have mail" messages to the logged in users.
The mailer was supposed to send it  the tty where the user was logged
in, and the subject of the Email. unprivileged users could link
/etc/passwd to /tmp/a and then send it: tty: ../tmp/a (8 chars max) and
subject: bla\nmyroot::0:0::/:/bin/sh which worked exactly as specified
in the manual....)

-- 
almost at the end of installation
https://bugs.launchpad.net/bugs/234835
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