I updated a Docker container from Ubuntu 19.10 to Ubuntu 20.04, and now svn checkouts are failing:
Step 11/12 : RUN svn checkout https://svn.cactuscode.org/projects/ExternalLibraries/hwloc/trunk
---> Running in c8f5b0058679
svn: E170013: Unable to connect to a repository at URL 'https://svn.cactuscode.org/projects/ExternalLibraries/hwloc/trunk' returned a non-zero code: 1
The internet tells me that this might be caused by old SSL libraries on the server which newer SVN versions refuse to use.
Things work when I downgrade to Ubuntu 19.10.