一個問題：monodevelop 2.8 老是卡退

  Ubuntu12.04下的monodevelop最近總是崩潰，多是由於前一階段垂涎14.04上的mono4.0致使本身一直在本本上折騰，卸載mono,卸載monodevelop 致使系統出現了一大堆莫名其妙的問題，後來雖然又把軟件源裏面提供的mono,monodvelop裝回來了，但是系統仍然沒有恢復原樣。

    就好比如今使用monodevelop總是在裝載工程的時候卡退了，鬱悶中。在命令行裏面啓動monodvelop輸出這麼一大堆

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: 不容許的操做.
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.
=================================================================

  配置什麼的一點都沒有該，而後就出現這種莫名其妙的錯誤了，說是讀取welcome page的時候出錯。

  解決辦法也有，就是將本身家目錄下的monodevelop的配置文件所有刪掉再重啓一下monodevelop就能正常打開了。

 刪除這三個目錄： （在家目錄下） 不會對你的工程形成影響

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

刪掉以後下次就能正常裝載工程了，可是仍是不能根本解決。只能湊合着用。