Gotwig, could you build an ISO image with ubuntu -proposed enabled and see if this upload fixes the issue? I suppose the repo has to be enabled on host.
If you can't use scripts from lp:ubuntu-cdimage, try building an elementary OS image with Congrego, it uses gfxboot-theme-ubuntu too. I hope it will be a sufficient test for verifying the fix.
Gotwig, could you build an ISO image with ubuntu -proposed enabled and see if this upload fixes the issue? I suppose the repo has to be enabled on host. theme-ubuntu too. I hope it will be a sufficient test for verifying the fix.
If you can't use scripts from lp:ubuntu-cdimage, try building an elementary OS image with Congrego, it uses gfxboot-