I had to do the following to connect to a D-Link DNS320L network drive after an update to Ubuntu Studio 20.10 (prior to the update the drive was discovered and mounted automatically in Dolphin).
- Add this to the [global] section in /etc/samba/smb.conf:
client min protocol = NT1
- Add a vers=1.0 option to fstab, so the entry in /etc/fstab is:
//192.168.0.99/Volume_1 /mnt/raid-lounge cifs vers=1.0,guest,uid=1000,iocharset=utf8 0 0