Apt update error - "An error occurred during the signature verification" (Chrome)
28247
Google Chrome PPA upgrade invalid signature
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
40885
What should I do when I got the KEYEXPIRED error message after an apt-get update?
107340
"Invalid signature file" when attempting to run a .jar
47062
How is the authenticity of Ubuntu updates verified?
115648
dpkg exit with error "cannot scan updates directory `/var/lib/dpkg/updates/': No such file or directory", how to fix it?
145400
Error when trying sudo apt-get update - Python related?
138125
dpkg: error: cannot scan updates directory `/var/lib/dpkg/updates/'
157904
error 503: service unavailable when using apt-get update behind proxy
90212
'http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 ./ Release' is not signed
13720
apt-get update fails to fetch files, “Temporary failure resolving …” error
12368
A "failed to fetch" error occurs when apt-get update is run. How do I fix this?
34069
Why am I getting authentication errors for packages from an Ubuntu repository?
135383
Unable to update my system Ubuntu13.04: Getting message - requires installation of untrusted packages
20710
Apt update fails at chrome stable main: "File has unexpected size (1103 != 1104). Mirror sync in progress?"
46419
The repository 'http://dl.google.com/linux/chrome/deb stable Release' does not have a Release file
50102
download.01.org certificate verification failed - CRLfile missing?