man: document how to get the boot menu with zero time-out
Fixes: #15125
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@ -176,8 +176,8 @@
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</varlistentry>
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</variablelist>
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<para>The following keys may be used during bootup or in the boot menu to
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<para>The following keys may be pressed during bootup or in the boot menu to directly boot a specific
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directly boot a specific entry:</para>
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entry:</para>
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<variablelist>
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<variablelist>
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<varlistentry>
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<varlistentry>
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@ -214,6 +214,17 @@
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</varlistentry>
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</variablelist>
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</variablelist>
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<para>The boot menu is shown when a non-zero menu timeout has been configured. If the menu timeout has
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been set to zero, it is sufficient to press any key — before the boot loader initializes — to bring up
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the boot menu, except for the keys listed immediately above as they directly boot into the selected boot
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menu item. Note that depending on the firmware implementation the time window where key presses are
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accepted before the boot loader initializes might be short. If the window is missed, reboot and try
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again, possibly pressing a suitable key (e.g. the space bar) continuously; on most systems it should be
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possible to hit the time window after a few attempts. To avoid this problem, consider setting a non-zero
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timeout, thus showing the boot menu unconditionally. Some desktop environments might offer an option to
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directly boot into the boot menu, to avoid the problem altogether. Alternatively, use the command line
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<command>systemctl reboot --boot-loader-menu=0</command> from the shell.</para>
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<para>In the editor, most keys simply insert themselves, but the following keys
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<para>In the editor, most keys simply insert themselves, but the following keys
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may be used to perform additional actions:</para>
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may be used to perform additional actions:</para>
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