Got that working now. Used getfacl --access | setfacl -R -d -M
user:username:permission dir. And username I used was squeezeboxserver.
Don't know why it didn't work earlier. Perhaps ubuntu set the permission
of the audio dir by defaults and they needed to be set differently by
acl.. well anyway
I have headless ubuntu server running in my home network and all my
music files are stored in that server. I use samba to share my music in
the network. I'd like to browse my music collection via webinterface
(ip/9000) with another pc and scan the collection so that squeezebox
touch could play