I tried to dual boot my windows 10 Acer aspire laptop 8gb ram and 256ssd with ubuntu, I successfully did it but, I have ubuntu on legacy mode and windows 10 on UEFI mode so every time I want to switch I have to open bios and change boot mode in between legacy and UEFI. I was trying to get the gnu option to choose between two OS, I tried various options through ubuntu boot-repair but no luck. Any help will be highly appreciated. Thanks in advance.
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You have to install Ubuntu in UEFI mode. – mikewhatever Mar 21 '20 at 14:54
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With UEFI Acer has an unique requirement of setting "trust" from within UEFI on ubuntu entry, which may be unknown until you set trust & rename it. You may need to update UEFI and if SSD, update SSD firmware. Acer Aspire E15 will not dual boot, many details Trust settings in step 35 http://askubuntu.com/questions/627416/acer-aspire-e15-will-not-dual-boot https://ubuntuforums.org/showthread.php?t=2297947&p=13369742#post13369742 & https://ubuntuforums.org/showthread.php?t=2297947 & – oldfred Mar 21 '20 at 16:00
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Basically, the best solution would be to clean reinstall Ubuntu ... but there are still a couple of solutions that are worth trying
see this post : How to change ubuntu install from legacy to uefi
I have tried & method 1 did work for me on a HP laptop, Win10 1903 + Ubuntu 18.04
Method 1: Disable the Compatibility Support Module (CSM; aka "legacy mode" or "BIOS mode" support) in your firmware. Boot the Ubuntu installer in its "try before installing" mode. Double-check that you've booted in EFI mode by looking for a directory called /sys/firmware/efi. If it's present, you've booted in EFI mode and can continue; but if it's absent, you've booted in BIOS mode and should review your firmware settings and how you created the boot medium. Download and run the Boot Repair program, as described here. Tell Boot Repair to repair your installation. Reboot. With any luck, GRUB will appear and give you the option of booting either Windows or Ubuntu. In some rare cases, the system may boot straight to Ubuntu in EFI mode and you'll need to tweak GRUB to get Windows to appear in the GRUB menu.
PS : rule #1 make a backup, rule #2 make a f*** backup, rule #3 ... check your backup is up-to-date and valid ;)
Nath
