Since Bitbucket announced end of Mercurial support here is the instruction and scripts to help migrating multiple repositories from Bitbucket Mercurial (Hg) to Git.

Prerequisites: Bash, Python 2.

Please follow instructios below:

Follow instructions here

Using Scraper Chrome extension it is easy to extract repository names from Bitbucket web site. Put extracted repository names into repositories.txt file one line each.

Execute bash clone.sh prefix command, substituting prefix with your organisation or personal Bitbucket URL prefix. This will clone all repositories into ./hg/ folder locally.

Execute bash transform.sh command to convert all Mercurial repositories in hg folder into Git repositories and output them to git folder. The proces will drop all non-merged unnamed heads from hg repositories, which is usually OK. If your repository is well maintained and merged nameless heads only represent abandoned lines of work.

.hgignore files has to be converted to .gitignore manually. Fortunately such conversion only needed if you continue to work on the project.

Create Gitlab account (if not already) and configure it to use SSH.

Create groups on Gitlab to match your organization names from Bitbucket.

Execute bash push.sh prefix to push all repositories from git folder to Gitlab, substituting prefix with your Group name or personal URL prefix.