I had a kernel upgrade 4.8.0-46 to 4.8.0.49 and I had the same issue.
# ip l set eno49 mtu 9000
RTNETLINK answers: Invalid argument
# tail -1 /var/log/kern.log
Apr 25 14:10:20 controller001 kernel: [64170.180920] eno49: Invalid MTU 9000
requested, hw max 68
# dpkg -l | grep linux-image-4.8
ii linux-image-4.8.0-46-generic 4.8.0-46.49~16.04.1
amd64 Linux kernel image for version 4.8.0 on 64 bit x86 SMP
ii linux-image-4.8.0-49-generic 4.8.0-49.52~16.04.1
amd64 Linux kernel image for version 4.8.0 on 64 bit x86 SMP
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https://bugs.launchpad.net/bugs/1679823
Title:
bond0: Invalid MTU 9000 requested, hw max 1500 with kernel 4.10 (or
4.8.0-49)
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