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Choosing C++ debugger on linux

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http://askubuntu.com – I recently changed from Windows where I was using Qt Creator to Ubuntu. The problem is that Qt Creator in Ubuntu can't properly debug due to some problem attaching ptrace to the program which was cause by a security upgrade as I found out. The only way to debug is to mess with the system settings and change the ptrace variable configuration but I'm not comfortable with this, as it compromises security. So my question is, is there anything close to Qt Creator or Visual Studio debugger in Linux? I mean being able to track variable values and pointers, etc. If not what's the standard debugger (HowTos)