[Bug 1955157] [NEW] Ubuntu installer overwrote the wrong hard drive bootloader

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I had ubuntu installed on my main hard drive, sda, and wanted to make an
external hard drive have its own ubuntu installation that was bootable.

I plugged it in, and used the live USB to install to it. (20.04.4 LTS
ubuntu desktop)

In ubiquity 20.04.15.17, on the partition manager, I selected something
else, and made the / partition on the external hard drive sdb (different
make and capacity so it was definitely the right hard drive). I also
added a swap partition to it too.

I changed the 'device for boot loader installation' to sdb also and
finished installation.

After installing, the external hard drive was not bootable. I unplugged
it, and tried to boot to my normal ubuntu desktop, which was also now
broken.

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


** Tags: bot-comment ubiquity
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Ubuntu installer overwrote the wrong hard drive bootloader
https://bugs.launchpad.net/bugs/1955157
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