aptitude install rpm sun-java6-sdk
rpm -i --nodeps /media/cdrom/Oracle/sqldeveloper-220.127.116.11.66-1.noarch.rpm
tr -d '\r' < /media/cdrom/Oracle/network/admin/tnsnames.ora > /etc/tnsnames.ora
tr -d '\r' < /media/cdrom/Oracle/network/admin/sqlnet.ora > /etc/sqlnet.ora
Note that rpm will issue a warning about Application not being a valid desktop category but that can be ignored, SQL Developer will be in Programming on the Gnome desktop menu. The 'tr' is used just in case your tnsnames.ora and sqlnet.ora came from a Windows environment (which will cause SQLPlus and SQL Developer to not recognize entires in them).