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I tried all the solutions before, but none of them worked for me. I had a fresh ubuntu 18.04 install and I only run apt update and apt upgrade, and after this when I wanted to install ROS melodic this error occured. I solved the problem based on this stack overflow comment: link text

Run:

sudo aptitude install ros-kinetic-desktop-full

Aptitude will display solutions, and just keep hitting 'n' until you get one that offers downgrades, and not leaving anything unresloved (otherwise ROS will not be installed).

I tried all the solutions before, but none of them worked for me. I had a fresh ubuntu 18.04 install and I only run apt update and apt upgrade, and after this when I wanted to install ROS melodic this error occured. I solved the problem based on this stack overflow comment: link text

Run:

sudo aptitude install ros-kinetic-desktop-full
ros-melodic-desktop-full

Aptitude will display solutions, and just keep hitting 'n' until you get one that offers downgrades, and not leaving anything unresloved (otherwise ROS will not be installed).