sudo apt-get install likewise-open

However, I got an error message when trying to join the domain:

“Error: Unable to resolve DC name resolving ‘test.example.org’ failed. Check that the domain name is correctly entered. Also check that your DNS server is reachable, and that your system is configured to use DNS in nsswitch.”

Having checked the nsswitch.conf and resolve.conf files, and having followed the advice on the Ubuntu forums about setting a static IP for the domain joining process,  I checked the  nsswitch.conf file again and found that the entries for winbind were missing.

My revised /etc/nsswitch.conf looked like:

# /etc/nsswitch.conf
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference’ and `info’ packages installed, try:
# `info libc “Name Service Switch”‘ for information about this file.

passwd:         compat winbind lwidentity
group:          compat winbind lwidentity
shadow:         compat winbind

hosts:          files dns winbind
networks:       files

protocols:      db files
services:       db files
ethers:         db files
rpc:            db files

netgroup:       nis