无论是aptget还是aptitude都upgrade不成功。

显示为读取changelog的时候，ssh返回一个tmp目录下的记录changelog的文件，命令行不滚动了。然后，等好长时间之后，只好control+c，终止进程（但是似乎终止不干净），重新输入upgrade命令，发现之前一个更新也没有装。看var下边apt的log文件也证明没有安装成功。

后来发现提示var/mail下边有信，打开看了发现如下内容：

E: Could not get lock /var/cache/apt/archives/lock – open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/cache/apt/archives/

所以怀疑进程没有正常终止，如下命令清楚锁：

sudo killall apt-get
sudo rm -rf /var/cache/apt/archives/lock
sudo apt-get update

,
重试，问题依旧。后来搜索“Reading changelogs”发现这篇文章中提到apt-listchanges

“Reading changelogs.” apt-listchanges isn’t particularly useful, and I don’t know why I installed it. But it’s really painful when it’s taking more time to read changelogs than to install your software. Geoffrey suggested gdb -p `pgrep apt-listchanges` and then forcing it to call exit(0), which worked like a charm. Had to do this several times; thought it was infinitely looping.

记得之前在其他的文章中也看过这个程序，所以怀疑是他的原因。

sudo apt-get purge apt-listchanges

删除这个软件之后，apt-get upgrade恢复正常。

参考：

Ubuntu 11.04 update manager got stuck
Fix for – E: Could not get lock /var/cache/apt/archives/lock – open (11: Resource temporarily unavailable)
解决了Could not get lock /var/cache/apt/archives/lock

另外，ubuntu的apt-get参考：
AptGetHowto