![]() ![]() They have been ignored, or old ones used instead. N: See apt-secure(8) manpage for repository creation and user configuration details.Į: Failed to fetch Unable to find expected entry '' in Release file (Wrong sources.list entry or malformed file)Į: Failed to fetch 404 Not Found Į: Some index files failed to download. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. W: The repository ' xenial Release' does not have a Release file. It will open in your preferred text editor. sudo apt update & sudo apt -y upgrade & sudo apt -y autoremove Closing Thoughts. Then, run: crontab -e to begin editing your crontab, a table of tasks to run automatically at a given time. So upgrade command will be run after update command. To setup cron to update apt, in a terminal type: sudo su to access a root-level prompt. This command will download packages and upgrade accordingly. So when you run update command, it downloads the package information from the Internet. The real update operation will be down with upgrade command. The sources often defined in the /etc/apt/sources.list file and other files located in /etc/apt/ directory. *Error Message / Sever: Err:11 xenial/main amd64 Packages 404 Not Found The sudo apt-get update command is used to download package information from all configured sources. Fix PATH: sudo apt-get install -reinstall nodejs-legacy fix /usr/bin/node. To upgrade to latest version (and not current stable) version, you can use. ![]() sudo npm cache clean -f sudo npm install -g n sudo n stable. ★ROS-kinetic / Rviz / gazebo /turtlebot3 > already installed Use n module from npm in order to upgrade node. Ubuntu 16.04 / ROS-kinetic / Notebook: / Multi-boot: Windows 10 (C drive) / Ubuntu (E drive) Upgrading packages ( apt upgrade) Regularly updating your Linux system is one of the most important aspects of overall system security. *Purpose: Install "turtlebot" for kinetic(16.04) / (ROS book - Morgan Quigley, studying) sudo apt update Always update the package index before upgrading or installing new packages. ![]()
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