Hi,

I just installed Ubuntu 19.04 fresh onto a machine.  Using Emacs (both
version 26.1 installed via apt, and also version 26.2 installed via
Guix) and Gnus configs that worked on a previous system, I tried setting
up nnimap for Gmail using TLS, but gnus failed to connect to
imap.gmail.com.  The *Messages* output was:

--8<---------------cut here---------------start------------->8---
Opening connection to imap.gmail.com via tls...
Unable to open server nnimap+gmail due to: Process *nnimap* not running
nnimap (gmail) open error: ‘’.  Continue? (y or n) n
Couldn’t open server on gmail
Warning: Unable to open server nnimap+gmail due to: Process *nnimap* not running
--8<---------------cut here---------------end--------------->8---

I also captured the following packets using Wireshark: