[Note that this problem has been fixed in Unslung 2.12-beta and later versions.]
Oct 2004, Unslung 1.11: The ipkg upgrade doesn't seem to work for now. So why don't you use remove / install instead ...
/ # ipkg update Downloading http://ipkg.nslu2-linux.org/ipkg/Packages ... Connecting to ipkg.nslu2-linux.org[220.127.116.11]:80 Packages 100% |*****| 13181 00:00 ETA Done. Updated list of available packages in /usr/lib/ipkg/lists/unslung / # ipkg upgrade [: 1.00-1: bad number Not downgrading package busybox from 1.00-rc3-1 to 1.00-1 Package gdbm (1.8.3-1) installed in root is up to date Package zlib (1.2.1-1) installed in root is up to date Package libid3tag (0.15.1b-1) installed in root is up to date [: 0.2.1-pre1-2: bad number Not downgrading package mt-daapd from 0.2.0-1 to 0.2.1-pre1-2 [: 2.6.3-2: bad number Not downgrading package rsync from 2.6.3-1 to 2.6.3-2 Package nfs-server (2.2beta47-1) installed in root is up to date Package portmap (4-1) installed in root is up to date / # ipkg remove mt-daapd ipkg_remove: Removing mt-daapd... ipkg_remove: Warning: Not removing the following directories since they are not empty: /opt /opt/sbin /opt/etc /opt/etc/init.d /opt/var /opt/var/mt-daapd Done. / # ipkg install mt-daapd Downloading http://ipkg.nslu2-linux.org/ipkg/mt-daapd_0.2.1-pre1-2_armeb.ipk ... Connecting to ipkg.nslu2-linux.org[18.104.22.168]:80 mt-daapd_0.2.1-pre1- 100% |*****| 132 KB 00:00 ETA Done. Unpacking mt-daapd...Done. Configuring mt-daapd... To complete this installation, make any necessary changes to the config file in /opt/etc/mt-daapd/mt-daapd.conf, and start the daemon by running /opt/etc/init.d/S60mt-daapd Done. / #