Build instructions are broken on Jessie
The following packages have unmet dependencies: vagrant-libvirt : Depends: ruby-fog-libvirt (>= 0.3.0) but it is not going to be installed
ruby-fog-libvirt/stretch depends on Stretch’s Ruby, that IMO we should not try installing on Jessie.
IMO the best fix is to simply require Stretch.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information