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Change user in Ubuntu OS

By Prasad Naik
June 25, 2026

Normally Ubuntu allows you to install OS as non root username So you need to login to server as non root user and run command mentioned below to login as root user sudo -i Once you login as root user change below mentioned parameter in /etc/ssh/sshd_config and uncomment PermitRootLogin paramter and change to to yes […]

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W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY B493DBE84A1DB3CD

By Prasad Naik
June 21, 2017

    While trying to run an update  in Ubuntu 14.04 was getting an error sudo apt-get update   Hit http://security.ubuntu.com trusty-security InRelease Ign http://ppa.launchpad.net precise InRelease Get:1 http://ppa.launchpad.net precise Release.gpg [836 B] Hit http://security.ubuntu.com trusty-security/main Sources Hit http://ppa.launchpad.net precise Release Ign http://ppa.launchpad.net precise Release Hit http://security.ubuntu.com trusty-security/restricted Sources Ign http://ppa.launchpad.net precise/main amd64 Packages/DiffIndex Hit […]

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