Try to use Samba on Ubuntu in the VirtulBox, access from Windows always failed,

Check the Samba log:

​​tail /var/log/samba/log.lenovo-xhl-pc​​

Result as below (partially copy),

​​../source3/lib/util.c:801(smb_panic_s3) smb_panic(): calling panic action​​ This command resolved the problem,

​​$ apt-get install --reinstall libsmbclient libsmbclient-dev libtevent0 libtalloc2​​

It seems that the new samba package poorly specified the dependencies it needed, so require to re-install these library.

Reference link:
​​​ https://answers.launchpad.net/ubuntu/+question/291448​​