Public bug reported:
when you do a manual install and choose a partition which already has an os on
it.
then you get warned that the os will be erased... good that is what I want...
but then it does not actually erase the old os instead it adds files to it and
the result is unbootable.
steps to reproduce:
1) on an empty partition install an os such as 14.04
2) do all the ususal stuff... such as installing updates, fini
now decide to start over with a clean version of the os
3) manually install a new os, select the partition that was used before
4) see the nice warning about how the old files will be erased.... ok
5) watch as it ~appears~ to make an inventory of all the files already present
on the partition huh?
6) watch as it ~appears~ to selectivly add files and or overwrite existing files
7) fini, attempt to boot the newly installed os
result: fails to boot, os is corrupt
expected: it should have erased the relevant directories, basically
everything except home... before adding new files.
now, confirm problem by manually erasing everything from the partition
and reinstalling and then everything works.
Note: your actualy milage will vary depending on what os you are
installing on top of what os. for instance if you instal the same bits
on top of the same bits, then your os will work and you won't notice the
problem. you have to have oses that are similar but not quite
compatibile in order for this failure to become apparent.
** Affects: ubiquity (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1296071
Title:
install over existing does not delete old - result in corrupt install
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