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I think I had two different versions of Ros. I removed all installed Ros in my system by the following command and installed it again by "apt-get install ros-melodic-desktop-full" and my problem solved.

sudo apt-get remove apt list --installed |grep ros- |cut -d '/' -f 1 |xargs

I think I had two different versions of Ros. I removed all installed Ros in my system by the following command and installed it again by ~~"apt-get~~

apt-get install ros-melodic-desktop-full" ros-melodic-desktop-full

and my problem solved.

~~sudo apt-get remove apt `apt list --installed |grep ros- |cut -d '/' -f 1 |xargs|xargs`~~

       
                
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