Mounting my ReadyNAS from Nautilus stopped working after upgrading to Ubuntu 20.04. Turns out there was a change in behavior in Sambva v4.11 that disabled SMB1 protocol by default. It’ll be interesting to see how this pans out in the rest of the Linux community … fortunately there’s a workaround!
Update: same on Debian 11 (bullseye) and Linux Mint 20 (Ulyana)
The fix, from AskUbuntu and Reddit, suggest lowering the min
protocol version. To do this, open /etc/samba/smb.conf with your
favorite editor:
sudo mg /etc/samba/smb.conf
Add the following line to the [global] section:
client min protocol = NT1
If you’re using Nautilus (Files, Nemo), you’re done. But if you’re using Samba, e.g. from the command line, restart it to make change take effect:
sudo systemctl restart smbd.service
That’s it. If it doesn’t work, you could try setting an ever lower protocol version:
client min protocol = CORE
For me, however, using NT1 makes everything work. Including renaming
files and such, which does not work with CORE.