I want to start the Recovery mode on an Ubuntu-only machine. The problem is that machine seems to skip grub and boot directly into ubuntu (as it is the only OS installed.
How can I boot into the recovery mode (whether it is through GRUB or not)
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According to this, holding the Shift key while booting should bring up the GRUB menu. If the Shift doesn't work, repeatedly pressing the Esc may work.
I once, not in the purpose of getting into grub (actually I was measuring the time it takes for Ubuntu to boot), did this and successfully accessed grub menu: Boot up your computer by pressing the power key While it's booting, long press on the power key to turn it off (I am not sure if it is a very safe way to get into grub) Turn it on again with the power key, and... Voila! Here you are at the grub menu. ;) You're welcome!