For 12.04 and the problem mounting your NAS, could you try adding the following to your /etc/samba/smb.conf, in the [global] section, and then rebooting?:
client ipc signing = disabled
For 12.04 and the problem mounting your NAS, could you try adding the following to your /etc/samba/ smb.conf, in the [global] section, and then rebooting?:
client ipc signing = disabled