$ sudo apt install npm
The following packages have unmet dependencies:
 npm : Depends: node-gyp (>= 0.10.9) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.


$ sudo apt install node-gyp
The following packages have unmet dependencies:
 node-gyp : Depends: nodejs-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

$ sudo apt install nodejs-dev
The following packages have unmet dependencies:
 nodejs-dev : Depends: libssl-dev (>= 1.0.2) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

$ sudo apt install libssl-dev
The following packages have unmet dependencies:
 libssl-dev : Depends: libssl1.1 (= 1.1.0g-2ubuntu4) but 1.1.0g-2ubuntu4.1 is to be installed
              Recommends: libssl-doc but it is not going to be installed
E: Unable to correct problems, you have held broken packages.