[sr #110546] git clone https://git.savannah.gnu.org/... fails with error "server certificate verification failed"

[Bruno Haible]

Follow-up Comment #7, sr #110546 (project administration):

> I am surprised that you found Ubuntu 16.04 and Ubuntu 18.04 affected since
as I understood it those were still under LTS support and I presume would have
updates available to them.

I tested Ubuntu 16.04 and Ubuntu 18.04 in their original state, not fully
patched.
1) because the Docker images for these OSes, used for continuous integration
builds, are not fully patched.
2) because also some desktop users prefer to not fully patch their systems.

The simple commands mentioned in
https://stackoverflow.com/questions/21181231/

sudo apt-get install -y apt-transport-https ca-certificates
sudo update-ca-certificates

work on Ubuntu 18.04; they upgrade the package 'ca-certificates' to version
20210119~18.04.2, and this fixes the issue.

However, on Ubuntu 16.04 in its original state they don't help.

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