Options GRUB_HIDDEN_TIMEOUT and GRUB_HIDDEN_TIMEOUT_QUIET are deprecated
in grub. Use
info -f grub -n 'Simple configuration'
and then you read in there:
`GRUB_HIDDEN_TIMEOUT'
Wait this many seconds before displaying the menu. If <ESC> is
pressed during that time, display the menu and wait for input
according to `GRUB_TIMEOUT'. If a hotkey associated with a menu
entry is pressed, boot the associated menu entry immediately. If
the timeout expires before either of these happens, display the
menu for the number of seconds specified in `GRUB_TIMEOUT' before
booting the default entry.
If you set `GRUB_HIDDEN_TIMEOUT', you should also set
`GRUB_TIMEOUT=0' so that the menu is not displayed at all unless
<ESC> is pressed.
This option is unset by default, and is deprecated in favour of
the less confusing `GRUB_TIMEOUT_STYLE=countdown' or
`GRUB_TIMEOUT_STYLE=hidden'.
`GRUB_HIDDEN_TIMEOUT_QUIET'
In conjunction with `GRUB_HIDDEN_TIMEOUT', set this to `true' to
suppress the verbose countdown while waiting for a key to be
pressed before displaying the menu.
This option is unset by default, and is deprecated in favour of
the less confusing `GRUB_TIMEOUT_STYLE=countdown'.
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https://bugs.launchpad.net/bugs/1258597
Title:
Warning: Setting GRUB_TIMEOUT to a non-zero value when
GRUB_HIDDEN_TIMEOUT is set is no longer supported.
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https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1258597/+subscriptions
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