I am not built the server. I am created snapshot and i am working on it.
I am used these commands to upgrade docker and kernel version:
sudo apt-get dist-upgrade
sudo apt-get update && sudo apt-get upgrade
After upgrading Docker version still 1.9.1 
I tried to upgrade Docker version with this command:
wget -qO- https://get.docker.com/ | sh
When i run docker run -it --rm hello-world command here is the output:
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete
Digest: sha256:f9dfddf63636d84ef479d645ab5885156ae030f611a56f3a7ac7f2fdd86d7e4e
Status: Downloaded newer image for hello-world:latest
docker: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "process_linux.go:301: running exec setns process for init caused \"exit status 23\"": unknown.
When i run ./launcher rebuild app here is the output:
WARNING: We are about to start downloading the Discourse base image
This process may take anywhere between a few minutes to an hour, depending on your network speed
Please be patient
Unable to find image 'discourse/base:2.0.20200220-2221' locally
2.0.20200220-2221: Pulling from discourse/base
bc51dd8edc1b: Pulling fs layer
27ae5d171719: Pulling fs layer
bc51dd8edc1b: Verifying Checksum
bc51dd8edc1b: Download complete
bc51dd8edc1b: Pull complete
27ae5d171719: Verifying Checksum
27ae5d171719: Download complete
27ae5d171719: Pull complete
Digest: sha256:b3acee0b655f071e98205dbd12fa78b95a6dd4038d27f1259177f76ab2efe4f7
Status: Downloaded newer image for discourse/base:2.0.20200220-2221
/usr/bin/docker: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "process_linux.go:301: running exec setns process for init caused \"exit status 23\"": unknown.
Your Docker installation is not working correctly
See: https://meta.discourse.org/t/docker-error-on-bootstrap/13657/18?u=sam