Can i downgrade ROS?
I need ROS melodic for my project. But i already installed noetic. Can i downgrade it? or can i use both if i install melodic?
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What operating system are you using?
ubuntu 20.04
Melodic is recommended to run with Ubuntu 18.04. I wouldn’t recommend installing both in Ubuntu 20.04. Everything is possible but this configuration is not supported. Also Python 3 is native in Ubuntu 20.04 so some of your melodic applications might not work either as they might use Python 2.7
Perhaps you can consider virtual environment to have them co-exist.if you go back to ROS Melodic then Ubuntu 18.04 as recommended.
I would suggest to take a step back, and ask @aspqwhy (s)he believes "ROS melodic [is needed] for [his] project".
You are right @gvdhoorn considering Melodic will be unsupported in the near future, the first question should be why not use Noetic
let me clarify that i was so confused about ros and dont know what to do for my final project. But finally i figure it out how use ros and i dont need to downgrade my ROS version. I was thinkin i have to use melodic for some packages and i figure that out thats not necesarry for that. But thank you for your helps.