Public bug reported:

When using manual partitioning, and designating an existing partition
containing files as the "/" partition, the installer issues a warning
that its going to delete "directories containing system files", and
lists (/etc, /lib, /usr, /var) as examples.

However, I had files in /old, and they were deleted too, much to my
dismay. (The only thing that saved me here is that this was a btrfs
filesystem, and I still had the ext2 backup snapshot. Whew!)

Is this intended behavior? Is /old considered a "directory containing
system files"? So perhaps there's a bug here.

Even if /old _is_ properly in the list of directories to be nuked,
there's a usability problem here. In my opinion, the warning message
here is would be far better to actually scan the
directories existing on the partition, and specifically report *which*
directories it's going to delete. That will give users confidence that
they're not about to get bitten.

You might also include an option to instead _move_ these old system
directories into a safe place (say, underneath /old.backup).

I'm installing Ubuntu 16.04 Server, using whatever version of debian-
installer comes on the CD.

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New

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  Installer deletes more files from existing partition than it says it

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