iMac installation of Big Sur

What to do if installation of Big Sur on iMac hangs at “less than a minute remaining?”

iMac 27″, macOS 10.13

Posted on Sep 24, 2021 09:39 AM

Top-ranking reply

rkaufmann87

Level 10

148,038 points

Posted on Sep 24, 2021 09:42 AM

It may be complete. Wait another 6-8 hours and if it does not complete, then force shut down the computer and then restart.

View in context

Similar questions

Installing Big Sur on compatible iMac. When I try to install Big Sur on compatible iMac running Catalina it stops when showing nearly finished. Anything I should be looking for?
642 1
I am upgrading my iMac OS but it’s stuck I am upgrading my iMac to Big Sur and it’s stuck on “Less than a minute remaining” but it’s been more like 20 minutes. What do I do now?
756 3
The mac os big sur install stuck on OS 10.9.5 2014 mac pro The mac os big sur can not install on my mac book pro Retina, 13-inch, Mid 2014, OS 10.9.5. The installation is stuck after the agreement confirm. The continue button clicked but no more response from the installation program. Anyone knows how to fix it?
1254 1

3 replies

Top-ranking reply

rkaufmann87

Level 10

148,038 points

Sep 24, 2021 09:42 AM in response to snow day

It may be complete. Wait another 6-8 hours and if it does not complete, then force shut down the computer and then restart.

snow day Author

Level 1

4 points

Sep 24, 2021 11:49 AM in response to rkaufmann87

Thank you. I restarted twice and the 2nd time it worked.

rkaufmann87

Level 10

148,038 points

Sep 24, 2021 01:25 PM in response to snow day

Good to hear!

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

iMac installation of Big Sur

Welcome to Apple Support Community

A forum where Apple customers help each other with their products. Get started with your Apple Account.

Learn more Sign up