https://askubuntu.com/questions/345588/what-is-the-safest-way-to-clean-up-boot-partition
https://askubuntu.com/questions/518997/how-do-i-re-run-boot-loader
https://askubuntu.com/questions/345588/what-is-the-safest-way-to-clean-up-boot-partition
https://askubuntu.com/questions/518997/how-do-i-re-run-boot-loader