I have a Gitlab CE 11.7 docker running on my server. When I import a project from gitlab.com, its wiki is missing. I use the built-in interface to import the projects:
New Project > Import project [tab] > GitLab.com [button]
then I choose the repository to import from a list of repositories connected to my account.
Is there a way to migrate the wiki of a repository from Gitlab.com to a GitLab CE instance?
Wikis are repos as well. You can clone a project by doing:
git clone https://gitlab.com/{namespace}/{project}.wiki.git
If you click the "Git Access" link at the top in your wiki, you also get this URL.
Since it is a repo you can then push to the desired destination wiki.