If you change the fstab line to:
sshfs#skipper@deep-thought:/home/skipper/archive /home/skipper/archive fuse allow_other,ro,_netdev 0 0
does it work?
If you change the fstab line to:
sshfs#skipper@ deep-thought: /home/skipper/ archive /home/skipper/ archive fuse allow_other, ro,_netdev 0 0
does it work?