извините..а где он этот пакет? 
https://sourceforge.net/projects/novacoin/files/novacoin-0.5.5/ubuntu/ubuntu-14.04/
Quote
novacoin-qt_0.5.5~fe3160e5-1_amd64.deb < 5 hours ago 1.4 MB 3 i
novacoind_0.5.5~fe3160e5-1_amd64.deb < 5 hours ago 829.4 kB 1 i
novacoin-qt_0.5.5~fe3160e5-1_i386.deb < 5 hours ago 1.4 MB 1 i
novacoind_0.5.5~fe3160e5-1_i386.deb < 5 hours ago 855.9 kB 0 i
novacoind_0.5.5~fe3160e5-1_amd64.deb < 5 hours ago 829.4 kB 1 i
novacoin-qt_0.5.5~fe3160e5-1_i386.deb < 5 hours ago 1.4 MB 1 i
novacoind_0.5.5~fe3160e5-1_i386.deb < 5 hours ago 855.9 kB 0 i