tail -f /var/log/kernel.log

Oct 15 21:43:07 Laptop kernel: [ 3910.412985] No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3 (or SMB2.1) specify vers=1.0 on mount.
Oct 15 21:43:07 Laptop kernel: [ 3910.418005] CIFS VFS: Error connecting to socket. Aborting operation.
Oct 15 21:43:07 Laptop kernel: [ 3910.418016] CIFS VFS: cifs_mount failed w/return code = -111

/media/movies cifs auto,*`vers=1.0`*,credentials=/etc/samba/user,noexec 0 0

Oct 15 21:49:06 Laptop kernel: [ 4269.887208] CIFS VFS: Error connecting to socket. Aborting operation.
Oct 15 21:49:06 Laptop kernel: [ 4269.887218] CIFS VFS: cifs_mount failed w/return code = -111

>● smb.service
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)

service smbd status
>● smbd.service - LSB: start Samba SMB/CIFS daemon (smbd)
   Loaded: loaded (/etc/init.d/smbd; bad; vendor preset: enabled)
   Active: active (exited) since Mon 2018-10-15 21:11:36 CEST; 43min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 1136 ExecStart=/etc/init.d/smbd start (code=exited, status=0/SUCCESS)
Oct 15 21:11:38 rabbithole smbd[1159]:    #10 /usr/sbin/smbd(main+0x1899) [0x55c64af04099]
Oct 15 21:11:38 rabbithole smbd[1159]:    #11 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f410b059b97]
Oct 15 21:11:38 rabbithole smbd[1159]:    #12 /usr/sbin/smbd(_start+0x29) [0x55c64af04199]
Oct 15 21:11:38 rabbithole smbd[1159]: [2018/10/15 21:11:38.090690,  0] ../source3/lib/util.c:801(smb_panic_s3)
Oct 15 21:11:38 rabbithole smbd[1159]:   smb_panic(): calling panic action [/usr/share/samba/panic-action 1159]
Oct 15 21:11:38 rabbithole smbd[1159]: [2018/10/15 21:11:38.098636,  0] ../source3/lib/util.c:809(smb_panic_s3)
Oct 15 21:11:38 rabbithole smbd[1159]:   smb_panic(): action returned status 0
Oct 15 21:11:38 rabbithole smbd[1159]: [2018/10/15 21:11:38.098738,  0] ../source3/lib/dumpcore.c:303(dump_core)
Oct 15 21:11:38 rabbithole smbd[1159]:   dumping core in /var/log/samba/cores/smbd
Oct 15 21:11:38 rabbithole smbd[1159]:

sudo smbclient -L //server_ip -U user

WARNING: The "syslog" option is deprecated
Enter diet's password:
Connection to 192.168.178.21 failed (Error NT_STATUS_CONNECTION_REFUSED)

diet@rabbithole:~$ sudo cat /var/log/samba/log.nmbd
[2018/10/15 21:11:36.244286,  0] ../lib/util/become_daemon.c:124(daemon_ready)
  STATUS=daemon 'nmbd' finished starting up and ready to serve connections
[2018/10/15 21:11:36.244592,  0] ../lib/util/fault.c:78(fault_report)
  ===============================================================
[2018/10/15 21:11:36.244651,  0] ../lib/util/fault.c:79(fault_report)
  INTERNAL ERROR: Signal 11 in pid 1135 (4.3.11-Ubuntu)
  Please read the Trouble-Shooting section of the Samba HOWTO
[2018/10/15 21:11:36.244708,  0] ../lib/util/fault.c:81(fault_report)
  ===============================================================
[2018/10/15 21:11:36.244750,  0] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 1135): internal error
[2018/10/15 21:11:36.245703,  0] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 11 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/samba/libsmbregistry.so.0(log_stack_trace+0x1a) [0x7f58521627aa]
   #1 /usr/lib/x86_64-linux-gnu/samba/libsmbregistry.so.0(smb_panic_s3+0x20) [0x7f5852162880]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f585445ff1f]
   #3 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(+0x1b136) [0x7f5854460136]
   #4 /lib/x86_64-linux-gnu/libpthread.so.0(+0x12890) [0x7f58548c4890]
   #5 /usr/lib/x86_64-linux-gnu/libtalloc.so.2(talloc_get_size+0x5) [0x7f58517005a5]
   #6 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(event_add_to_poll_args+0x76) [0x7f5853846556]
   #7 /usr/sbin/nmbd(listen_for_packets+0xff) [0x5590a81f47af]
   #8 /usr/sbin/nmbd(main+0xcf6) [0x5590a81e3bb6]
   #9 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f5850cfbb97]
   #10 /usr/sbin/nmbd(_start+0x29) [0x5590a81e3f79]
[2018/10/15 21:11:36.245966,  0] ../source3/lib/util.c:801(smb_panic_s3)
  smb_panic(): calling panic action [/usr/share/samba/panic-action 1135]
[2018/10/15 21:11:36.259765,  0] ../source3/lib/util.c:809(smb_panic_s3)
  smb_panic(): action returned status 0
[2018/10/15 21:11:36.260473,  0] ../source3/lib/dumpcore.c:303(dump_core)
  dumping core in /var/log/samba/cores/nmbd
[2018/10/16 22:25:50.464532,  0] ../lib/util/become_daemon.c:124(daemon_ready)
  STATUS=daemon 'nmbd' finished starting up and ready to serve connections
[2018/10/16 22:25:50.501751,  0] ../lib/util/fault.c:78(fault_report)
  ===============================================================
[2018/10/16 22:25:50.501817,  0] ../lib/util/fault.c:79(fault_report)
  INTERNAL ERROR: Signal 11 in pid 1069 (4.3.11-Ubuntu)
  Please read the Trouble-Shooting section of the Samba HOWTO
[2018/10/16 22:25:50.501886,  0] ../lib/util/fault.c:81(fault_report)
  ===============================================================
[2018/10/16 22:25:50.501927,  0] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 1069): internal error
[2018/10/16 22:25:50.502887,  0] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 11 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/samba/libsmbregistry.so.0(log_stack_trace+0x1a) [0x7f58a6df07aa]
   #1 /usr/lib/x86_64-linux-gnu/samba/libsmbregistry.so.0(smb_panic_s3+0x20) [0x7f58a6df0880]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f58a90edf1f]
   #3 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(+0x1b136) [0x7f58a90ee136]
   #4 /lib/x86_64-linux-gnu/libpthread.so.0(+0x12890) [0x7f58a9552890]
   #5 /usr/lib/x86_64-linux-gnu/libtalloc.so.2(talloc_get_size+0x5) [0x7f58a638e5a5]
   #6 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(event_add_to_poll_args+0x76) [0x7f58a84d4556]
   #7 /usr/sbin/nmbd(listen_for_packets+0xff) [0x5626ea7dc7af]
   #8 /usr/sbin/nmbd(main+0xcf6) [0x5626ea7cbbb6]
   #9 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f58a5989b97]
   #10 /usr/sbin/nmbd(_start+0x29) [0x5626ea7cbf79]
[2018/10/16 22:25:50.503153,  0] ../source3/lib/util.c:801(smb_panic_s3)
  smb_panic(): calling panic action [/usr/share/samba/panic-action 1069]
[2018/10/16 22:25:50.512666,  0] ../source3/lib/util.c:809(smb_panic_s3)
  smb_panic(): action returned status 0
[2018/10/16 22:25:50.512764,  0] ../source3/lib/dumpcore.c:303(dump_core)
  dumping core in /var/log/samba/cores/nmbd
[2018/10/18 19:44:06.860935,  0] ../lib/util/become_daemon.c:124(daemon_ready)
  STATUS=daemon 'nmbd' finished starting up and ready to serve connections
[2018/10/18 19:44:06.894869,  0] ../lib/util/fault.c:78(fault_report)
  ===============================================================
[2018/10/18 19:44:06.894939,  0] ../lib/util/fault.c:79(fault_report)
  INTERNAL ERROR: Signal 11 in pid 1046 (4.3.11-Ubuntu)
  Please read the Trouble-Shooting section of the Samba HOWTO
[2018/10/18 19:44:06.894998,  0] ../lib/util/fault.c:81(fault_report)
  ===============================================================
[2018/10/18 19:44:06.895041,  0] ../source3/lib/util.c:789(smb_panic_s3)
  PANIC (pid 1046): internal error
[2018/10/18 19:44:06.896034,  0] ../source3/lib/util.c:900(log_stack_trace)
  BACKTRACE: 11 stack frames:
   #0 /usr/lib/x86_64-linux-gnu/samba/libsmbregistry.so.0(log_stack_trace+0x1a) [0x7f1e44bbf7aa]
   #1 /usr/lib/x86_64-linux-gnu/samba/libsmbregistry.so.0(smb_panic_s3+0x20) [0x7f1e44bbf880]
   #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) [0x7f1e46ebcf1f]
   #3 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(+0x1b136) [0x7f1e46ebd136]
   #4 /lib/x86_64-linux-gnu/libpthread.so.0(+0x12890) [0x7f1e47321890]
   #5 /usr/lib/x86_64-linux-gnu/libtalloc.so.2(talloc_get_size+0x5) [0x7f1e4415d5a5]
   #6 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(event_add_to_poll_args+0x76) [0x7f1e462a3556]
   #7 /usr/sbin/nmbd(listen_for_packets+0xff) [0x55ff3c5c47af]
   #8 /usr/sbin/nmbd(main+0xcf6) [0x55ff3c5b3bb6]
   #9 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f1e43758b97]
   #10 /usr/sbin/nmbd(_start+0x29) [0x55ff3c5b3f79]
[2018/10/18 19:44:06.896297,  0] ../source3/lib/util.c:801(smb_panic_s3)
  smb_panic(): calling panic action [/usr/share/samba/panic-action 1046]
[2018/10/18 19:44:06.906076,  0] ../source3/lib/util.c:809(smb_panic_s3)
  smb_panic(): action returned status 0
[2018/10/18 19:44:06.906178,  0] ../source3/lib/dumpcore.c:303(dump_core)
  dumping core in /var/log/samba/cores/nmbdADDED 18-10-2018

diet@rabbithole:~$ sudo apt-get install libtevent-dev=0.9.28-0ubuntu0.14.04.1

Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libtevent-dev : Depends: libtevent0 (= 0.9.28-0ubuntu0.14.04.1) but 0.9.34-1 is to be installed
E: Unable to correct problems, you have held broken packages.