$ rmadison nagvis nagvis | 1:1.4.6-1.1+squeeze1 | squeeze | source, all nagvis | 1:1.6.6+dfsg.1-2 | wheezy | source, all nagvis | 1:1.6.6+dfsg.1-2 | sid | source, all nagvis | 1:1.6.6+dfsg.1-3~bpo60+1 | squeeze-backports | source, all so there is no smooth upgrade path from squeeze-backports to wheezy Andreas