Comment 9 for bug 1397685

I also encountered similar problem when run:

$ git clone -v https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
Cloning into 'linux-firmware'...
* Couldn't find host git.kernel.org in the .netrc file; using defaults
* Hostname was NOT found in DNS cache
* Trying 199.204.44.194...
* Trying 2620:3:c000:a:0:1991:8:25...
* Immediate connect fail for 2620:3:c000:a:0:1991:8:25: Network is unreachable
* Trying 2001:4f8:1:10:0:1991:8:25...
* Immediate connect fail for 2001:4f8:1:10:0:1991:8:25: Network is unreachable
* Connected to git.kernel.org (199.204.44.194) port 443 (#0)
* found 173 certificates in /etc/ssl/certs/ca-certificates.crt
* gnutls_handshake() failed: Handshake failed
* Closing connection 0
fatal: unable to access 'https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/': gnutls_handshake() failed: Handshake failed

OS: Ubuntu 14.04 64bits.

I checked "apt-get update"
and ensure that packages: git and libcurl3-gnutls are latest.
Installed version:
git: 1:1.9.1-1ubuntu0.3
libcurl3-gnutls: 7.35.0-1ubuntu2.9

If change git clone URL from https to http, git clone successful.

Thank you very much!