I am getting the "error: diskfilter writes are not supported \n press
any key" on an Ubuntu 20LTS install.
No Raid in my case, just an SSD.
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https://bugs.launchpad.net/bugs/1756517
AFAIK, grub-installer (the udeb package) already has logic to install
correctly on RAID systems, by using the underlying devices. This should
be writing grub-*/install-devices as well, which should be taking care
of package upgrades.
diskfilter writes not being supported in grub is certainly not
** Description changed:
This has and continues to affect all releases of Ubuntu including 18.04
and probably beyond.
This bug is to track potential fixes to allow writes for some common
scenarios - the easiest being a RAID-1 mirror where it is just a case of
mapping the writes to the
