During testing with debian deployment on EFI hosts, we noticed that the /tmp/finish.sh throws an error: in-target: /tmp/finish.sh: 325: /tmp/finish.sh: [[: not found. This is caused by provisioning_templates/snippet/efibootmgr_netboot.erb which uses double brackets when testing for efi. Replacing the test cases with single brackets will make efibootmgr_netboot compliant with sh.

The fix for this has been pushed into develop branch, however fixing this in the stable branches should be considered. I've attached a patch based on 1.24-stable which fixes the issue. Please let me know if you need anything else.

--BtH