[Bug 1453465] [NEW] Installation Media always wants to swap onto sda1 and 5 making installation impossible

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I have a laptop with a 64 GB SSD. It had two partitions sda1 and 2 for
my former swap and root partition.

I downloaded the Ubuntu MATE 15.04 ISO and dd'ed it onto a USB stick and
booted from that.

At the disk partitioning step of the installer I told it to use the whole disk to create the standard partition layout with ext4.
After clicking "Start Installation" a window popped up, telling me that the creating of the filesystem on sda has failed.

I tried several manual layouts, filesystems with the manual partitioning
step until I opend gparted on the Live image and saw that it uses the
/dev/sda partitions as swap. I used swapoff to disable swap on these
partitons. I nuked the partiton table and verified that there is no
partion and no swap active on /dev/sda  with lsblk. I reran the
installer told it to use the entire (now blank) disk. Same error. Again
after parition creation /dev/sda1 was instantly used as swap making the
filesystem creation fail. I was a bit surprised that it always created
/dev/sda1, sda2 (just a 1kb parition) and sda5 and not simply 1 and 2.

I found out that in /etc/fstab apart from the usual overlay stuff and
tmpfs for the Live Image /dev/sda1 and /dev/sda5 are both declared as
swap devices (terrible idea). I deleted those two lines and stoped
systemd-swap.target for good measure. Afer that the installation just
worked. No more complaints about not being able to create a filesystem
on the sda partition. I'm surprised it even let it swap onto /dev/sda1
the first time which was an old ext4 parition.

So for me this looks like if I use the Ubuntu MATE Live USB/CD on my 2GB
RAM laptop and open to many tabs in a browser it will just start
overwriting the first drive.

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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Installation Media always wants to swap onto sda1 and 5 making installation impossible
https://bugs.launchpad.net/bugs/1453465
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