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Reason

Some dependencies are not installed, and the previously installed versions of the dependencies are not correct, some require downgrade, and some require upgrade

Install environment

Use the original sources.list: dep http://ports.ubuntu.com/bionic main res...

Other sources.list: ustc, tuna... have not been tested

Solution

Install aptitude

    sudo apt-get install aptitude

2.Install ros-melodic-desktop-full with aptitude

sudo aptitude install ros-melodic-desktop-full

3.The first prompt reminds us that there are a lot of things that are not installed, about 100-600, let us choose to keep the original ones, but there is no at all, enter n here

4.The second prompt may ask us to upgrade or downgrade something, this is what we need, choose Y

5.Select Y to install

6.After that, “-O APT:::GET::Fix-Missing=true” may appear, execute: sudo apt-get --fix-missing

7.Repeat a few times from step 1-5, each time you will find that things you need to install will be reduced a lot, and finally, if you have no problem after step 5, it will automatically install ros.

It works for me

Reason

Some dependencies are not installed, and the previously installed versions of the dependencies are not correct, some require downgrade, and some require upgrade

• Install environment

Use the original sources.list: dep http://ports.ubuntu.com/bionic main res...

Other sources.list: ustc, tuna... have not been tested