zero@HP-Mini:~$ apt-cache policy jackd jackd2 libjack-jack2-dev
jackd:
Installed: 5
Candidate: 5
Version table:
*** 5 0
500 http://mirrors.163.com/ubuntu/ precise/universe i386 Packages
100 /var/lib/dpkg/status
jackd2:
Installed: 1.9.8~dfsg.1-1ubuntu2
Candidate: 1.9.8~dfsg.1-1ubuntu2
Version table:
*** 1.9.8~dfsg.1-1ubuntu2 0
500 http://mirrors.163.com/ubuntu/ precise-updates/universe i386 Packages
100 /var/lib/dpkg/status
1.9.8~dfsg.1-1ubuntu1 0
500 http://mirrors.163.com/ubuntu/ precise/universe i386 Packages
N: Unable to locate package libjack-jack2-dev