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I am running Fedora 25 on a 64-bit ARM (AArch64) host, and tried testing 
the latest (F26) version of diskimage-builder,

   # cat /etc/redhat-release
   Fedora release 25 (Twenty Five)

   # rpm -q diskimage-builder
   diskimage-builder-1.26.1-1.fc26.noarch

but I encountered an error with the following command:

   disk-image-create -a arm64 -o test.qcow2 vm ubuntu
     :

   + install-packages -m bootloader grub-pc
   Reading package lists... Done
   Building dependency tree
   Reading state information... Done
   Package grub-pc is not available, but is referred to by another package.
   This may mean that the package is missing, has been obsoleted, or
   is only available from another source
   However the following packages replace it:
     grub2-common grub-common

   E: Package 'grub-pc' has no installation candidate


Is this a known issue, or am I possibly just using the wrong (or missing 
an) option when running this command?

If this is a real issue and not already reported, please let me know if 
I need to file a ticket.


Thank you,

d.marlin