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I want to remove or greatly reduce the time for which the GRUB screen appears. I have used GRUB customizer and gedit. All the values are what they need to be, yet the screen remains for 30 seconds. Using Ubuntu 18.04.

What could be the problem, and how can I fix it?

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    No one can verify that "all the values are what they need to be" based on the information you have provided. edit your question and include the complete text of /etc/default/grub. – Organic Marble Mar 7 '19 at 16:08
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    @stevej you mean splash screen or the grub menu options screen?? – PRATAP Mar 7 '19 at 16:17
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    I don't understand why no one has looked at the manual for grub-mkconfig or update-grub where they advocate only running the command during distribution upgrade or when discovering new kernels to generate new entries. It is a dangerous command that can reconfigure the grub and cause boot failure. Advocating the change to /etc/default/grub requires running update-grub for it to be effective, while editing the timeout values in grub.cfg is quick, simple and does not actually change the main structure of the grub.cfg itself. If you only change these timeout values who can mess anything up! – BarBar1234 Mar 7 '19 at 20:39
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    @Pilot6 We don't know what it is based on the limited info provided. – Organic Marble Mar 7 '19 at 20:50
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    The 30 sec no matter what is in /etc/default/grub is clear enough. – Pilot6 Mar 7 '19 at 20:54

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