I have the same problem.
CIFS drive does not mount at boot, but works OK after sudo mount -a.
After checking the dmesg output, found the following:
[   21.401090] IPv6: ADDRCONF(NETDEV_UP): enp14s0: link is not ready
[   21.409315] r8169 0000:0e:00.0 enp14s0: link down
[   21.409391] IPv6: ADDRCONF(NETDEV_UP): enp14s0: link is not ready
[   21.426414] IPv6: ADDRCONF(NETDEV_UP): wlp20s0: link is not ready
[   21.576880] IPv6: ADDRCONF(NETDEV_UP): wlp20s0: link is not ready
[   21.784873] IPv6: ADDRCONF(NETDEV_UP): wlp20s0: link is not ready
[   27.087515] FS-Cache: Loaded
[   27.113285] FS-Cache: Netfs 'cifs' registered for caching
[   27.113434] Key type cifs.spnego registered
[   27.113445] Key type cifs.idmap registered
[   27.125723] CIFS VFS: Error connecting to socket. Aborting operation.
[   27.125812] CIFS VFS: cifs_mount failed w/return code = -101
[   27.440130] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU 
pipe B FIFO underrun
[   37.997256] wlp20s0: authenticate with 8c:10:d4:61:7b:8c
[   38.016336] wlp20s0: send auth to 8c:10:d4:61:7b:8c (try 1/3)
[   38.120061] wlp20s0: send auth to 8c:10:d4:61:7b:8c (try 2/3)
[   38.121720] wlp20s0: authenticated
[   38.124072] wlp20s0: associate with 8c:10:d4:61:7b:8c (try 1/3)
[   38.127684] wlp20s0: RX AssocResp from 8c:10:d4:61:7b:8c (capab=0x411 
status=0 aid=2)
[   38.129296] wlp20s0: associated


If I understand that correctly, CIFS tries to mount the partition while the 
network is still down.

Would be happy if that helps.

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Title:
  after upgrading to 16.04 (xubuntu) network drive not mounted

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