How to fix – Warning apt-key is deprecated

Last week I tried to install Ulauncher into a Linux Mint 21 freshly installed. After installing Ulauncher using: sudo add-apt-repository ppa:agornostal/ulauncher && sudo apt update && sudo apt install ulauncher I got this error: «Warning apt-key is deprecated«. After some Googling, I found this that help me to fix it. Fixing process: $ sudo apt-key list Now, we need to remember the last 8 Hexa digits (99503176) of the corresponding

(Solution) Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?

Hello, To solve this issue when trying to apt-get your Ubuntu Linux use these commands: Option 1: ps aux | grep aptsudo kill processId Option 2: sudo rm /var/lib/apt/lists/lock Maybe it is also needed to:sudo rm /var/cache/apt/archives/locksudo rm /var/lib/dpkg/lock Regards,Rubén