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Table of Contents
apt errors
apt key error
When apt-get update shows the following error with only debian repositories:
W: There is no public key available for the following key IDs:
The simple fix is to install the debian-archive-keyring package and repeat the update process
apt-get install debian-archive-keyring apt-get update
For google chrome repository and error:
W: There is no public key available for the following key IDs: 1397BC53640DB551
The fix is to:
wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
For other NO_PUBKEY errors, make a note of the ID, then use
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys KEY
not configured yet
In case of dpkg dependency errors of a package that isn't configured yet, trigger configuration manually.
Example error:
dpkg: dependency problems prevent processing triggers for libglib2.0-0:i386: libglib2.0-0:i386 depends on libc6 (>= 2.28); however: Package libc6:i386 is not configured yet.
sudo dpkg --configure -a
apt-key deprecated
Apt Error: “Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).”
Find the repository causing the error. Note that the apt-key output does not contain the url but descriptions and it might be difficult to find the relevant entry.
sudo apt-key list
Once the entry is found, use the last 2 blocks of 4 characters of the key id to export it and then create a separate gpg file fir it:
sudo apt-key export 12345678 | sudo gpg --dearmour -o /etc/apt/trusted.gpg.d/name-of-file.gpg
Finally, the old key id can be removed from the trusted.gpg file:
sudo apt-key --keyring /etc/apt/trusted.gpg del 12345678
see this for newer and secure method:
https://stackoverflow.com/questions/68992799/warning-apt-key-is-deprecated-manage-keyring-files-in-trusted-gpg-d-instead/71384057#71384057
apt fastest mirror
apt-get now supports a 'mirror' method that will automatically select a good mirror based on your location. Adding the following at the top of /etc/apt/sources.list file will pick the best mirror:
Follow this with:
vi /etc/apt/sources.list
Adjust for the appropriate ubuntu distribution.
deb mirror://mirrors.ubuntu.com/mirrors.txt focal main restricted universe multiverse deb mirror://mirrors.ubuntu.com/mirrors.txt focal-updates main restricted universe multiverse deb mirror://mirrors.ubuntu.com/mirrors.txt focal-backports main restricted universe multiverse deb mirror://mirrors.ubuntu.com/mirrors.txt focal-security main restricted universe multiverse
Do an update for apt to get/select the best mirror before any installs:
apt-get update