[R-sig-Debian] FYI libcurl conflicts in ubuntu 18.04

[Jeroen Ooms]

One of the curl maintainers has pointed me to this bug report on
Launchpad that may affect r-base users:
https://bugs.launchpad.net/ubuntu/+source/curl/+bug/1754294

The issue is that ubuntu now ships both libcurl3 (gnutls, nss) as well
as libcurl4 (openssl) which cannot be installed concurrently. Because
r-base-core depends on libcurl4, it will conflict with any other
packages depending on libcurl3.