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macOS Big Sur Installation Failed: 'An Error Occurred While Installing the Selected Updates'

Ugh, this free update that the entire world is trying to download simultaneously isn't going exactly how I want it to. Also, I'm supposed to wait?!? I wait for no one! When my mother and I were being chased by Congolese Spotted Lions, did I wait for her when she tripped and fell? No! I yelled "It's your incompetence at running, idiot! That's why you're being eaten!" Wait... pssh. Try doing better technology next time, Apple. Where's the manager?
 
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Of course this has to affect me, too. I wished you could just download the installer like before. I'm actually using it to install on an unsupported mac...
 
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same here in Germany ...
1605218022191.png
 
tonyr6 said:
Had the same issue. Blamed it on Microsoft updater for the edge browser. My Macbook 16" was so slow that I had to restore a backup.
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Same here on MBP16". Really, really slow. Restarting didn't help, so went through recovery and then restarted and that seems to have cured it.
 
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It installed very quickly on my MacBook Pro 13 2018 running RC2– I bet RC2 is almost identical to the release today.
But my iMac 2020 had the problems described above.

The beta installation experience of Big Sur has been very disappointing. I could not even install it for the first several betas then suddenly it worked around beta 6. Installing RC1 brought lots of trouble — my MacBook entered a reboot loop but I fixed it. And yesterday RC2 gave me the same headache of a reboot loop and the solution for RC1 did not work!!! Took me a few hours to get it sorted out. But this is beta and I get it. Now this for the final release? What is happening to Apple?
 
Same issue: "Installation Failed: An error occurred while installing the selected updates." Tried install from system pref, and link from App Store. This morning it was stuck on downloading, but now I just get this error, no downloading at all
 
Here is how to fix slow down issue.

Press cmd+R when booting, and run disk utility->first aid on your disk.

I did it, it's work for me.
 
ghulst said:
Same here on MBP16". Really, really slow. Restarting didn't help, so went through recovery and then restarted and that seems to have cured it.
Click to expand...
I booted into recovery and ran first aid on the 2 Mac portions. that fixed the slowness and the issue I was having with third party apps not working.
 
Well, we're off to a good start. I hope this is not the proverbial canary in the coal mine for next week's launch of the M1 lineup.
 
I was able to install Big Sur on the current Mac mini. Had beta profile on there removed it and it installed a smaller update around 2.5gb bu too go on any of my MacBooks. Thought it was my Macs and have run first aid and a few other fixes but. Feel a little better know it is not my devices. At least my new iPhones are arriving today. Something to be happy about.
 
anshuvorty said:
This has to be it. I am getting "update not found" error in terminal when I run the update:

Code: 
REDACTED@REDACTED ~ % sudo softwareupdate --fetch-full-installer --full-installer-version 11.0.1
Password:
Downloading and installing 11.0.1 installer
SUPreferenceManager: Failed to set object of class: __NSCFConstantString for key: LastRecommendedMajorOSBundleIdentifier with error: Error Domain=SUPreferenceManagerErrorDomain Code=1 "(null)"
Install failed with error: Update not found
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Did you do this already on Big Sur? If so, it only worked on earlier versions of macOS, from what I read earlier.
 
ghulst said:
Same here on MBP16". Really, really slow. Restarting didn't help, so went through recovery and then restarted and that seems to have cured it.
Click to expand...
Glad its not me. All apps were beach balling. What really ticks me off is that it downloaded the full update then everything slowed down just so it could fail. Then the entire computer was slow. At least I know CCC works so I will be purchasing it when my trail is up just waiting to see if they have any black Friday deals on the license.
 
For those who's install failed and are having issues running slow / faulty 3rd party programs:
Had the same problem, it's back to normal after doing the following:

1. Obviously, shutdown and run a quick: command + option + p + r after the apple shows up hold until it disappears and reappears.

2. Reset SMC on a Mac with the T2 chip:
  1. Shut down your Mac
  2. Press and hold Shift + Ctrl + Option for about 7 seconds (make sure the cable is plugged in)
  3. While holding the keys, press and hold the power button for another 7 seconds
  4. Restart your computer.
3. Finally, reset SMC on a desktop computer with the T2 chip:
  1. Shut down your computer
  2. Unplug the power cord, wait for about 15 seconds, and plug it back in
  3. Wait a few seconds and restart the computer.
I'm pretty sure the T2 chip was my issue. Best of luck.
 
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Started at 1:30 and got through 2.5 GB before it quit. I tried deleting the files from "/Library/Updates/" and using my hotspot to download, but all I get is the "Installation Failed" alert.
 
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