Latest OSX release blocking apt-get and wget from within ssh. Problem resolving hostnames?

Hi Clay,
I’ve noticed this week that I seem no longer to be able to run commands such as apt-get and wget from within my local containers. The only thing I can think that’s changed is the latest OSX release – 10.13.4 (17E199) – was installed over the weekend.

So, for example, when I run apt-get update -y I get

Err http://deb.debian.org jessie InRelease                           
  
Err http://security.debian.org jessie/updates InRelease              
  
Err http://deb.debian.org jessie-updates InRelease                   
  
Err http://security.debian.org jessie/updates Release.gpg            
  Temporary failure resolving 'security.debian.org'
Err http://deb.debian.org jessie Release.gpg                         
  Temporary failure resolving 'deb.debian.org'
Err http://deb.debian.org jessie-updates Release.gpg
  Temporary failure resolving 'deb.debian.org'
Reading package lists... Done    
W: Failed to fetch http://deb.debian.org/debian/dists/jessie/InRelease  

W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/InRelease  

W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease  

W: Failed to fetch http://deb.debian.org/debian/dists/jessie/Release.gpg  Temporary failure resolving 'deb.debian.org'

W: Failed to fetch http://security.debian.org/dists/jessie/updates/Release.gpg  Temporary failure resolving 'security.debian.org'

W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/Release.gpg  Temporary failure resolving 'deb.debian.org'

W: Some index files failed to download. They have been ignored, or old ones used instead.

When I run wget https://phar.phpunit.de/phpunit-5.7.19.phar
I get:

converted 'https://phar.phpunit.de/phpunit-5.7.19.phar' (ANSI_X3.4-1968) -> 'https://phar.phpunit.de/phpunit-5.7.19.phar' (UTF-8)
--2018-04-10 13:48:05--  https://phar.phpunit.de/phpunit-5.7.19.phar
Resolving phar.phpunit.de (phar.phpunit.de)... failed: Name or service not known.
wget: unable to resolve host address 'phar.phpunit.de'

Any ideas where the disconnect may be.