[Bug 1851383] [NEW] disk format hang during install of 19.10 in KVM virtual machine

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I'm trying to install a KVM virtual machine using the ubuntu 19.10 live
iso. It always gets as far as the step where it is going to format the
blank disk (in this case a newly created qcow2 image with a 20G size
limit). I then see the virtual machine go to 100% cpu usage and the
installer goes completely unresponsive.

I've tried this on a centos 7 host and a fedora 31 host with the same
result on both.

I've tried telling it to let me customise the partitions and letting it
automatically create partitions with the same result - 100% cpu loop and
hung unresponsive interface (sometimes a black screen, sometimes the
partition tool, but not responding).

The specific iso file is ubuntu-19.10-desktop-amd64.iso. I've checked
the checksums and verified the signature, so it doesn't seem to be
corrupted.

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


** Tags: bot-comment
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disk format hang during install of 19.10 in KVM virtual machine
https://bugs.launchpad.net/bugs/1851383
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