Thanks for filing this bug in Ubuntu.
Unfortunately this report does not contain enough information to
diagnose the issue.
Could you please run the following command in a terminal:
sudo apport-collect -p samba 1829916
This will collect some data from your system and attach it to this
report.
I
This may be https://bugzilla.samba.org/show_bug.cgi?id=13315, found also
in https://bugzilla.samba.org/show_bug.cgi?id=13315, but we don't even
have the crash file and I can't reproduce it at the moment by just
connecting using SMB1: it won't crash.
** Bug watch added: Samba Bugzilla #13315
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