I'm using Ubuntu 11.04. The update manager once found the new release 'oneiric', and still shows up this screen when I log on use ssh:
Welcome to Ubuntu 11.04 (GNU/Linux 2.6.38-14-generic x86_64) * Documentation: https://help.ubuntu.com/0 packages can be updated.0 updates are security updates.New release 'oneiric' available.Run 'do-release-upgrade' to upgrade to it.Last login: Wed Apr 25 16:22:48 2012 from ***But I didn't upgrade then, and change my apt sources. And now I cannot upgrade to 'oneiric'. do-relase-upgrade shows:
$ sudo do-release-upgradeChecking for a new ubuntu releaseNo new release found$And apt-get dist-upgrade shows:
$ sudo apt-get dist-upgradeReading package lists... DoneBuilding dependency treeReading state information... DoneCalculating upgrade... Done0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.$I can successfully update all my packages.
File contents of source.list:
$ cat /etc/apt/sources.list## See sources.list(5) for more information, especialy# Remember that you can only use http, ftp or file URIsdeb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ natty main universe restricted multiversedeb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ natty main universe restricted multiversedeb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ natty-security universe main multiverse restricteddeb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ natty-security universe main multiverse restricteddeb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ natty-updates universe main multiverse restricteddeb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ natty-updates universe main multiverse restricteddeb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ natty-backports universe main multiverse restricteddeb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ natty-backports universe main multiverse restricted# deb http://ubuntu.dormforce.net/ubuntu/ lucid main universe restricted multiverse# deb-src http://ubuntu.dormforce.net/ubuntu/ lucid main universe restricted multiverse# deb http://ubuntu.dormforce.net/ubuntu/ lucid-security universe main multiverse restricted# deb-src http://ubuntu.dormforce.net/ubuntu/ lucid-security universe main multiverse restricted# deb http://ubuntu.dormforce.net/ubuntu/ lucid-updates universe main multiverse restricted# deb-src http://ubuntu.dormforce.net/ubuntu/ lucid-updates universe main multiverse restricted# CDROMs are managed through the apt-cdrom tool.# deb http://archive.canonical.com lucid partner# deb http://archive.canonical.com lucid-security partner# deb http://archive.canonical.com lucid-updates partner# deb-src http://archive.canonical.com lucid partner# deb-src http://archive.canonical.com lucid-security partner# deb-src http://archive.canonical.com lucid-updates partner#medibuntu repo# deb http://packages.medibuntu.org/ lucid free non-free# deb-src http://packages.medibuntu.org/ lucid free non-free# deb http://extras.ubuntu.com/ubuntu maverick main #Third party developers repositorydeb http://mirrors.sohu.com/ubuntu/ natty main restricted multiverse universedeb-src http://mirrors.sohu.com/ubuntu/ natty main universe restricted multiverse #Added by software-propertiesdeb http://security.ubuntu.com/ubuntu/ natty-security universe main multiverse restricteddeb-src http://mirrors.sohu.com/ubuntu/ natty-security universe main multiverse restricteddeb http://mirrors.sohu.com/ubuntu/ natty-updates universe main multiverse restricteddeb-src http://mirrors.sohu.com/ubuntu/ natty-updates universe main multiverse restrictedFile contents of /etc/update-manager/meta-release:
$ cat /etc/update-manager/meta-release# default location for the meta-release file[METARELEASE]URI = http://changelogs.ubuntu.com/meta-releaseURI_LTS = http://changelogs.ubuntu.com/meta-release-ltsURI_UNSTABLE_POSTFIX = -developmentURI_PROPOSED_POSTFIX = -proposedWhat may be the problem of this?
