What does this error mean when installing gitlab?

Question

git

I run the following command
update-rc.d gitlab defaults 21
and I get this error

update-rc.d: using dependency based boot sequencing
insserv: script gitlab is not an executable regular file, skipped!

OS: Debian 8

Answer 1

It cannot upload a non-executable file.
Try

sudo chmod +x /etc/init.d/gitlab && sudo update-rc.d gitlab defaults 21