OCI Ubuntu: "apt update" Returns "Could not resolve 'security.ubuntu.com'"

Mar 19, 2024 7:43AM

Applies To:

Oracle Cloud Infrastructure - Version N/A and later

Linux x86-64

Symptoms:

When executing "apt update" or "apt-get update" on Ubuntu, the command can return an error about resolving software source.

For example,

# apt update
Err:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
Could not resolve 'security.ubuntu.com'

Cause:

When Network Manager is installed, a new netplan configuration replaces the old networkd with network-manager, taking control of all networking devices.

Solution:

Comment out all interfaces in the networkd configuration file:

# nano /etc/network/interfaces
##auto ens3
##iface ens3 inet dhcp
...
#

Enable Network Manager in the Netplan configuration file:

OCI Ubuntu: "apt update" Returns "Could not resolve 'security.ubuntu.com'"

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