> And update explicitly rebuilds the cache. It would be really nice if we could get back the old behavior here - the cache gets only rebuilded if there are only real changes. But I have found an easier testcase to reproduce this issue:
root@ubuntu:~# time apt-get clean real 0m0.025s user 0m0.004s sys 0m0.021s root@ubuntu:~# time apt-get check firefox Reading package lists... Done Building dependency tree Reading state information... Done real 0m6.724s user 0m3.423s sys 0m0.148s root@ubuntu:~# time apt-get check firefox Reading package lists... Done Building dependency tree Reading state information... Done real 0m0.447s user 0m0.430s sys 0m0.017s root@ubuntu:~# time apt-get clean real 0m0.018s user 0m0.004s sys 0m0.013s root@ubuntu:~# time apt-get check firefox Reading package lists... Done Building dependency tree Reading state information... Done real 0m6.516s user 0m3.371s sys 0m0.161s As this example shows "apt-get clean" causes the next command that reads from the package cache to rebuld it while there are even no explicit changes. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. https://bugs.launchpad.net/bugs/924283 Title: Package lists are fully readed if there are no changes Status in “apt” package in Ubuntu: Confirmed Bug description: I'm using Ubuntu 12.04 dev with apt 0.8.16~exp12ubuntu3. Since apt was updated from 0.8.16~exp5 to 0.8.16~exp12 the package lists are fully readed ("Reading package lists... Done") on every "apt-get update". This is no problem if there are new package lists available. But apt is doing now such a full reading even if the lists have not changed. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/924283/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
