gnutls_handshake erro ao instalar o nvidia-docker2

Question

Estou tentando instalar o nvidia-docker2 seguindo estas instruções . Ao executar:

sudo apt-get update

Eu tenho:

Err https://nvidia.github.io Packages
gnutls_handshake() failed: Handshake failed Err https://nvidia.github.io Packages
gnutls_handshake() failed: Handshake failed Err https://nvidia.github.io Packages
gnutls_handshake() failed: Handshake failed W: Failed to fetch https://nvidia.github.io/libnvidia-container/ubuntu14.04/amd64/Packages gnutls_handshake() failed: Handshake failed

W: Failed to fetch https://nvidia.github.io/nvidia-container-runtime/ubuntu14.04/amd64/Packages gnutls_handshake() failed: Handshake failed

W: Failed to fetch https://nvidia.github.io/nvidia-docker/ubuntu14.04/amd64/Packages gnutls_handshake() failed: Handshake failed

Quando tento ignorar o acima (esperando que ele não vá mexer com a instalação nvidia-docker2 real) e execute:

sudo apt-get install -y nvidia-docker2

ocorreram erros semelhantes (o que significa que provavelmente também lide com o erro anterior):

Err https://nvidia.github.io/libnvidia-container/ubuntu14.04/amd64/ libnvidia-container1 1.0.0~beta.1-1 gnutls_handshake() failed: Handshake failed Err https://nvidia.github.io/libnvidia-container/ubuntu14.04/amd64/ libnvidia-container-tools 1.0.0~beta.1-1 gnutls_handshake() failed: Handshake failed Err https://nvidia.github.io/nvidia-container-runtime/ubuntu14.04/amd64/ nvidia-container-runtime-hook 1.3.0-1 gnutls_handshake() failed: Handshake failed Err https://nvidia.github.io/nvidia-container-runtime/ubuntu14.04/amd64/ nvidia-container-runtime 2.0.0+docker18.03.0-1 gnutls_handshake() failed: Handshake failed Err https://nvidia.github.io/nvidia-docker/ubuntu14.04/amd64/ nvidia-docker2 2.0.3+docker18.03.0-1 gnutls_handshake() failed: Handshake failed E: Failed to fetch https://nvidia.github.io/libnvidia-container/ubuntu14.04/amd64/./libnvidia-container1_1.0.0~beta.1-1_amd64.deb gnutls_handshake() failed: Handshake failed

E: Failed to fetch https://nvidia.github.io/libnvidia-container/ubuntu14.04/amd64/./libnvidia-container-tools_1.0.0~beta.1-1_amd64.deb gnutls_handshake() failed: Handshake failed

E: Failed to fetch https://nvidia.github.io/nvidia-container-runtime/ubuntu14.04/amd64/./nvidia-container-runtime-hook_1.3.0-1_amd64.deb gnutls_handshake() failed: Handshake failed

E: Failed to fetch https://nvidia.github.io/nvidia-container-runtime/ubuntu14.04/amd64/./nvidia-container-runtime_2.0.0+docker18.03.0-1_amd64.deb gnutls_handshake() failed: Handshake failed

E: Failed to fetch https://nvidia.github.io/nvidia-docker/ubuntu14.04/amd64/./nvidia-docker2_2.0.3+docker18.03.0-1_all.deb gnutls_handshake() failed: Handshake failed

De qualquer forma, o problema é que gnutls_handshake falha. Como faço para corrigir esse problema?

Estou usando o 14.04.1-Ubuntu.