Getting "unable to verify macOS" when upgrading to Catalina
128505
"macOS Catalina" could not be verified
93193
This copy of the Install OS X El Capitan application can't be verified. It may have been corrupted or tampered with during downloading
57478
"iTunes can’t verify the identity of the server ..." after a Security Update in Mavericks or upgrade to El Capitan
46720
sudo apt update error: "Release file is not yet valid"
28705
Is there a Meltdown vulnerability fix already available for macOS?
50102
download.01.org certificate verification failed - CRLfile missing?
47021
After MacOS High Sierra install, localhost fails and apache has syntax errors
153266
errors upgrading from 14.04 to 16.04 about Unknown Multi-Arch type for compiz, libkf5akonadisearch-bin packages
4305
How do I fix a "Problem with MergeList" or "status file could not be parsed" error when trying to do an update?
95066
New to Macbook Pro, need help upgrading
79327
How do you perform a clean install of macOS High Sierra with APFS?
114492
How can I upgrade from Mac OS X Tiger 10.4?
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
148808
Update from Mac OS X 10.6.8 to the newest version
38925
Can you update to macOS 10.14 (Mojave) without converting to APFS?
16837
Unable to upgrade from 14.04 to 14.10 "Cannot Calculate Upgrades"
142167
my App Store is broken for Mac High Sierra 10.13.5