我在这个邮件里面回复了：部分客户端连接还勉强。
请不要在一个标题内讨论另一个话题！
2014年6月17日 下午10:53于 Xiang Liu xian...@yandex.com写道：
17.06.2014, 22:44, 杜宏羽 dongfengweix...@gmail.com:
如此，你只能选择使用源码重新编译你需要安装的软件了。实际上你可以使用deb提供的打包脚本重新来一次就可以了。当然了，要是源码已经指定了固定的版本那就无奈了。
我打算一直启用update源算了……
其实我很好奇，大家现在是怎么用gmail的，web大部分时候都上不去……
2014年6月17日 下午10:16于 Xiang Liu hsiang@gmail.com写道：
一般情形下，我都只启用security源进行升级。但是其中有一次，好像是为了安装calibre软件，我临时打开了update源，安装了该软件，导致libqtcore4等一系列软件包的版本高于security源的版本。
于是问题就出来了
要安装calligra套装，结果
The following packages have unmet dependencies:
calligra : Depends: karbon (= 1:2.4.0-0ubuntu2.1) but it is not
going to
be installed
Depends: calligraflow (= 1:2.4.0-0ubuntu2.1) but it is not
going to be installed
Depends: calligraplan (= 1:2.4.0-0ubuntu2.1) but it is not
going to be installed
Depends: calligrastage (= 1:2.4.0-0ubuntu2.1) but it is
not
going to be installed
Depends: krita (= 1:2.4.0-0ubuntu2.1) but it is not going
to
be installed
Depends: calligrasheets (= 1:2.4.0-0ubuntu2.1) but it is
not
going to be installed
Depends: calligrawords (= 1:2.4.0-0ubuntu2.1) but it is
not
going to be installed
Depends: kthesaurus (= 1:2.4.0-0ubuntu2.1) but it is not
going to be installed
Depends: kexi (= 1:2.4.0-0ubuntu2.1) but it is not going
to
be installed
Depends: braindump (= 1:2.4.0-0ubuntu2.1) but it is not
going
to be installed
E: Unable to correct problems, you have held broken packages.
倒腾好半天，才发现是libqt系列库在磁盘上的已安装版本高于security源的版本（也许是calligra精确指定了对应的依赖库的版本，而不是大于等于）。这下好了，我还没有办法安装了，除非我重新启用update源……
如果强制安装旧版本，会导致unity-2d,virtualbox, vlc 什么的都被卸载
$ sudo apt-get install libqtcore4=4:4.8.1-0ubuntu4.5
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer
required:
tea-data libboost-regex1.46.1 checkbox texlive-generic-extra
texlive-science antiword
libboost-signals1.46.1 lyx-common python-dateutil texlive-science-doc
elyxer
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
appmenu-qt checkbox-qt goldendict keepassx libdbusmenu-qt2
libdconf-qt0
libphonon4 libqt4-dbus
libqt4-declarative libqt4-network libqt4-opengl libqt4-script
libqt4-sql
libqt4-sql-sqlite libqt4-svg
libqt4-xml libqt4-xmlpatterns libqtbamf1 libqtdee2 libqtgconf1
libqtgui4
libqtwebkit4
libunity-2d-private0 lyx phonon phonon-backend-gstreamer qdbus
qt-at-spi
sni-qt tea ubuntu-desktop
unity-2d unity-2d-panel unity-2d-shell unity-2d-spread
virtualbox-4.3 vlc
The following packages will be DOWNGRADED:
libqtcore4
0 upgraded, 0 newly installed, 1 downgraded, 37 to remove and 0 not
upgraded.
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