booting into recovery mode hangs under 20.04

[Jack Howarth]

On a 2008 MacPro with GTX680 under Ubuntu 20.04, selecting the recovery
mode from grub hangs on loading of the ramdisk with the Recovery Menu
dialog never appearing. This problem doesn't exist for a fresh install of
Ubuntu 18.04 updated to the current package updates. In that case, the
Recovery Menu appears as expected. This bug in Ubuntu 20.04 was reproduced
for both an existing Ubuntu 19.10 installation dist-upgraded to Ubuntu
20.04 as well as for a fresh install of Ubuntu 20.04.

https://bugs.launchpad.net/ubuntu/+source/linux-meta/+bug/1873965

As a side note, there is no issue booting the kernel into single user mode
instead.
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