Add ro quiet splash to all entries
Solution 1:
This isn't possible with normal configuration. You have to edit the scripts that are run during grub-update. Take a look at this article. The essentials:
- Open
/etc/grub.d/30_os-proberwith root rights for editing. - Change the line
linux ${LKERNEL} ${LPARAMS}tolinux ${LKERNEL} ${LPARAMS} ${GRUB_CMDLINE_LINUX_DEFAULT} - run
sudo update-grubagain
You can also use your own variable for this. For details consider the linked article.