Yes, It was a Gmail "insecure device" problem.  I went through the "Allow less insecure access" reset.  New I can use Pegasus.  I agree with David Harris about Google throwing it's weight around.  Thank you for the response.

I think I've changed something with my Gmail access from Pegasus.  Whenever I check for new mail I get the following message:

 Pop3 network or protocol error

 15:07:18.028: --- 7 Jan 2020, 15:07:18.028 ---
15:07:18.028: Connect to 'pop.gmail.com', timeout 30 seconds.
15:07:19.292: [*] SSL/TLS session established
15:07:19.292: [*] ECDHE-RSA-AES256-GCM-SHA384, TLSv1.2, Kx=ECDH, Au=RSA, Enc=AESGCM(256), Mac=AEAD
15:07:19.292: [*] Peer's certificate name is '/C=US/ST=California/L=Mountain View/O=Google LLC/CN=pop.gmail.com'.
15:07:19.292: >> +OK Gpop ready for requests from 108.249.106.76 q134mb4018107oic
15:07:19.292: << USER michaelrobe
15:07:19.338: >> +OK send PASS
<< 0019 PASS XXXXXXXXXXXX
15:07:20.446: >> -ERR [AUTH] Username and password not accepted.

How can I resolve this problem?

[quote user="Michael Robertson"]

I think I've changed something with my Gmail access from Pegasus.  Whenever I check for new mail I get the following message:

 Pop3 network or protocol error

 15:07:18.028: --- 7 Jan 2020, 15:07:18.028 ---
15:07:18.028: Connect to 'pop.gmail.com', timeout 30 seconds.
15:07:19.292: [*] SSL/TLS session established
15:07:19.292: [*] ECDHE-RSA-AES256-GCM-SHA384, TLSv1.2, Kx=ECDH, Au=RSA, Enc=AESGCM(256), Mac=AEAD
15:07:19.292: [*] Peer's certificate name is '/C=US/ST=California/L=Mountain View/O=Google LLC/CN=pop.gmail.com'.
15:07:19.292: >> +OK Gpop ready for requests from 108.249.106.76 q134mb4018107oic
15:07:19.292: << USER michaelrobe
15:07:19.338: >> +OK send PASS
<< 0019 PASS XXXXXXXXXXXX

15:07:20.446: >> -ERR [AUTH] Username and password not accepted.

How can I resolve this problem?

[/quote]

I think I should add some additional information.  I am using a Windows 7 computer.  I can still access Gmail on the web using the same password and username as in the past.  I have been trying to set-up a Gmail account on a different hard drive using Ubuntu and Thurnderbird.  I am sure that this is where the problems have originated.  The username and password were rejected during this set-up attempt, then when I went to the Windows computer and attempted to log-on the above error message was displayed.

See this post. And so should do everybody else having issues with GMail from now on ... Oh, and here's David Harris' statement on this issue.