一个问题：monodevelop 2.8 总是卡退

Ubuntu12.04下的monodevelop最近老是崩溃，可能是因为前一阶段垂涎14.04上的mono4.0导致自己一直在本本上折腾，卸载mono,卸载monodevelop 导致系统出现了一大堆莫名其妙的问题，后来虽然又把软件源里面提供的mono,monodvelop装回来了，可是系统仍然没有恢复原样。

就比如现在使用monodevelop老是在装载工程的时候卡退了，郁闷中。在命令行里面启动monodvelop输出这么一大堆

loveWenQing ~$ monodevelop
ERROR [2014-07-22 16:20:19Z]: Error while reading welcome page contents.
System.ArgumentNullException: Argument cannot be null.
Parameter name: stream
  at System.IO.StreamReader.Initialize (System.IO.Stream stream, System.Text.Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize) [0x00000] in <filename unknown>:0
  at System.IO.StreamReader..ctor (System.IO.Stream stream, System.Text.Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize) [0x00000] in <filename unknown>:0
  at System.IO.StreamReader..ctor (System.IO.Stream stream) [0x00000] in <filename unknown>:0
  at (wrapper remoting-invoke-with-check) System.IO.StreamReader:.ctor (System.IO.Stream)
  at System.Xml.Linq.XDocument.Load (System.IO.Stream stream) [0x00000] in <filename unknown>:0
  at MonoDevelop.Ide.WelcomePage.WelcomePageBranding..cctor () [0x00000] in <filename unknown>:0
Basedir=/usr/lib/monodoc

Native stacktrace:

	monodevelop() [0x80e16fc]
	monodevelop() [0x80609b4]
	[0xb772d40c]
	monodevelop() [0x82217c6]
	monodevelop() [0x8221d10]
	monodevelop() [0x8221ed8]
	monodevelop() [0x82220ad]
	monodevelop() [0x8226462]
	/lib/i386-linux-gnu/libpthread.so.0(+0x6d4c) [0xb76c0d4c]
	/lib/i386-linux-gnu/libc.so.6(clone+0x5e) [0xb75ffbae]

Debug info from gdb:

Could not attach to process.  If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: 不允许的操作.
No threads.

=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================

配置什么的一点都没有该，然后就出现这种莫名其妙的错误了，说是读取welcome page的时候出错。

解决办法也有，就是将自己家目录下的monodevelop的配置文件全部删掉再重启一下monodevelop就能正常打开了。

删除这三个目录： （在家目录下） 不会对你的工程造成影响

.local/share/MonoDevelop-2.8/
.config/MonoDevelop-2.8/
.cache/MonoDevelop-2.8/

删掉之后下次就能正常装载工程了，但是还是不能根本解决。只能凑合着用。

一个问题：monodevelop 2.8 总是卡退