Thanks for taking your time to report this issue and help making Ubuntu better.
The good news is that iproute2 version 4.9.0-1 has been packaged in Debian. Normally this would be synced automatically, but since the current version in Ubuntu (4.3.0-1ubuntu3) contains some additional Ubuntu-patches, it will likely need to be merged manually.
Thanks for taking your time to report this issue and help making Ubuntu better.
The good news is that iproute2 version 4.9.0-1 has been packaged in Debian. Normally this would be synced automatically, but since the current version in Ubuntu (4.3.0-1ubuntu3) contains some additional Ubuntu-patches, it will likely need to be merged manually.