系统：Ubuntu 16.0.4
错误：
It seems you are upgrading from 10.x version series to 11.x series.
解决：
先升级到 10.x 的最后一个版本，然后再升级到 11.x 版本。
1 | sudo gitlab-rake gitlab:backup:create STRATEGY=copy |
1 | sudo apt-get update && sudo apt-get install gitlab-ce=10.8.7-ce.0 |
1 | sudo apt-get update && sudo apt-get install gitlab-ce |
1 | sudo gitlab-ctl reconfigure |
参考：
Upgrade paths[](https://docs.gitlab.com/ee/update/index.html#upgrade-paths
https://about.gitlab.com/update/#ubuntu
https://forum.gitlab.com/t/upgrading-gitlab-from-7-x-to-8-x/3008/12
gitlab releases: