Clang-format-10 fails in Travis CI

[astrogeco]

Describe the bug
Travis CI Fails with message:

The command "sudo apt-get install clang-format-10" failed and exited with 100 during .

See https://travis-ci.com/github/nasa/ci_lab/builds/152554544

Also has some warnings for deprecated tags in the YAML file:

root: deprecated key sudo (The key sudo has no effect anymore.)
language: unexpected sequence, using the first value (c)
root: missing os, using the default linux

see https://travis-ci.com/github/nasa/ci_lab/jobs/296302324/config

To Reproduce
Force a run of current master branch in Travis CI

Expected behavior
CI finishes set up and works.
No Travis warnings

System observed on:
Travis CI, Ubuntu - Bionic

Reporter Info
Gerardo E. Cruz-Ortiz NASA/GSFC