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I'm trying to install Ubuntu 20.04 alongside Windows 10 on my Acer computer. While trying to install Ubuntu, I was prompted with a warning about Intel's RST needing to be turned off. Following Choice #2 in heynnema's answer, I learned that I should:

(run in command prompt) bcdedit /set {current} safeboot minimal

(in BIOS) Change the SATA Operation mode to AHCI from either IDE or RAID

Before trying anything, I played a little bit with the BIOS to see how that could be done. Had to do some research and found this answer, which suggests:

a) access windows and then press windows + r and type msconfig. Then, go to system boot and activate safe boot. Then restart windows;

b) then access the BIOS, go to the main tab, press ctrl + s and change the sata mode to ahci.

That works, the option to change to AHCI is there. I haven't tried it yet because I was wondering if the bcdedit command proposed by heynnema does the same as following a) and activating safe boot through msconfig.

I thought doing both - in case they're similar commands - could cause me problems.

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    They do the same thing. – heynnema Aug 19 '20 at 18:23
  • Thanks. (1) Am I right to assume that after changing SATA to AHCI and booting in secure mode, if I go to msconfig and deactivate safe boot is the equivalent to running bcdedit /deletevalue {current} safeboot? (2) Should I expect Windows to work normally after this process to get RST turned off? – kiabbo Aug 19 '20 at 19:52
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    1) Should be... but I wouldn't recommend deviating from the written procedure too much. And you want to turn off FAST BOOT and HIBERNATION in Windows, and SECURE BOOT in your BIOS. 2) Yes. – heynnema Aug 19 '20 at 20:17
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From the comments...

RST

Recommend following the instructions (Choice #2) found in this answer without deviation.

In Windows

To disable FAST BOOT and HIBERNATION...

  • boot into Windows
  • open the Power control panel
  • choose change what the power buttons do
  • choose change options that are unavailable
  • uncheck fast startup
  • close the Power control panel
  • open an administrative command prompt window
  • type powercfg /h off

If you wish to check your C: drive, and others...

  • type chkdsk /f c:
  • approve to run chkdsk at next reboot
  • type chkdsk /f x: (replacing "x" with drive letters of other visible NTFS partitions)
  • reboot into Windows to let chkdsk run on drive C:

In BIOS

  • disable SECURE BOOT
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  • (1) Only after these steps have been taken, in this order, should I proceed with the Ubuntu installation? (2) Excuse my ignorance; why is it necessary to disable fast boot, hibernation and secure boot to be able to install Ubuntu alongside Windows (in a machine with Intel's RST)? (3) Should any of these changes be reverted after Ubuntu has been installed? – kiabbo Aug 19 '20 at 20:29
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    @kiabbo 1) Best way to do it. 2) To be able to install Ubuntu, and make it run reliably without problems from Windows. 3) No. – heynnema Aug 19 '20 at 20:32
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    For future reference: the above worked perfectly! On some computers, to be able to disable Secure Boot, a supervisor password should be set in BIOS. Also, to change to AHCI, I had to follow letter b) in my question. Might be useful for someone else. – kiabbo Aug 20 '20 at 16:21

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