How to resolve add-apt-repository command not found on Ubuntu

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Sometimes when to search to add a repository to come to the warning add-apt-repository: command not found, there may be the case the (preinstalled) command add-apt-repository is not available on your system, here the solution.

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How to fix the warning, "at-spi-registryd.desktop not responding" on Ubuntu

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In MateDesktops, sometimes when we have updated our operating system, and we want to restart the Computer, we receive a Window with this warning at-spi-registryd.desktop - Not responding, here I will tell how to solve this problem.

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