安装zlib后无法进入系统

我编译安装zlib后，重启了一下，就再也无法进入图形界面，进度条也没有出来，现在屏幕上就是一个白色圆形在转动。

切换到控制台下面可以登陆ctrl+alt+F1，登陆后运行startx，提示我：

X:warning;process set to priority -1 instead of requested priority 0

Fatal server error:
server is already active for dispaly 0
If this server is no longer running,remove /temp/.X0-lock
and start again.

Please consult the The X.Org Foundation support
at http://wiki.x.org for help

ddxSigGiveUp:Closing log
Invalid MIT-MAGIC-COOKIE-1 keygiving up
xinit:Resource temporarily unavailable(errno 11):unable to connect to X server
xinit:No such process(errno 3):server error

对了切换到控制台的时候，发现屏幕顶部提示：
Loading,please wait……
upsplash:Setting mode 1024*768 failed
upsplash:Setting mode 800*600 failed
upsplash:Setting mode 640*480 failed
screen init failed

此外，我运行任意不存在的命令，比如h，下面的提示是：
/usr/bin/python:/usr/local/lib/libz.so.1:no version information available(required by /usr/bin/python)

忘了说是Ubuntu 9.04