Add section about conflict with snap version of docker

Author: TheGuit

content/manuals/engine/daemon/troubleshoot.md

@@ -74,6 +74,27 @@ If `DOCKER_HOST` is set as intended, verify that the Docker daemon is running on
 the remote host and that a firewall or network outage isn't preventing you from
 connecting.
 
+### Check if you don't have Docker install with snap
+
+If you are not able to connect to docker, perhaps you have 2 versions of docker installed, standard package distribution (APT, Yum, ...) and Snap version.
+
+```console
+snap list | grep docker
+```
+
+If you have this kind of result : 
+```text
+docker                     27.2.0                      2963      latest/stable    canonical**     -
+```
+
+Disable and remove the snap :
+```console
+sudo snap disable docker && sudo snap remove docker --purge
+```
+
+Then reboot.
+
+
 ### Troubleshoot conflicts between the `daemon.json` and startup scripts
 
 If you use a `daemon.json` file and also pass options to the `dockerd` command