Fixed. Quoting marmarek:
"Missing libxen-4.6 update seems to be the cause, just uploaded the update. Also, enabling testing repository should be enough (the package was there, but I missed uploading it to stable). So, to fix the issue - start the template, access its console (sudo xl console debian-8) and install updates (sudo apt-get update && sudo apt-get -V dist-upgrade)." Thanks! -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To post to this group, send email to qubes-users@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/58daabd0-ee97-4d91-ac01-ad8dd10888f5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.