feat(launchDoctor): package mappings for Ubuntu 20.04 (#3155)
feat(launchDoctor): package mappings for Ubuntu 20.04 (#3155)

This teaches Launch Doctor to print a command to install missing
packages on Ubuntu 20.04.

References #2745
microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright