Some OVH dedicated server does not supports installing Debian original kernel due to hardware support issue.
Most common issue is the network adapter card.
- Intel ixgbe linux drivers : https://downloadcenter.intel.com/download/14687
- OVH forum : https://forum.ovh.co.uk/showthread.php?5616-Standard-Kernels-with-Ubuntu-Debian&p=73788&viewfull=1#post73788