This also happens in slack, and I don't think it's a problem with the distribution. It may be a problem with nautilus, since when I ctrl+alt+backspace and startx again, I can view smb:///
You could logout, back to a terminal, and then use startx and retry, or you could do..
Code:
mount -t smbfs -o username=USERNAME,password=PASSWORD //SERVERNAME/SHAREFOLDER /mnt/FOLDERNAME
though you're going to have to mkdir /mnt/FOLDERNAME first.