Looks like you just haven't updated your package lists, this is missing from the link that you gave - sudo apt-get update. This should download the list ...
@Takkat unzip is also a standard compression utility, provided by the package of the same name. It decompresses .zip files (whereas gunzip decompresses .gz files). user76114: Please edit your question to provide the information imwrng requested, and also the contents of the file /etc/apt/sources.list. –
14.04.2021 · If Ubuntu Packages website also shows that the package is not available for your specific version, then you’ll have to find some other ways to install the package. Take Shutter for example. It’s an excellent screenshot tool for Linux but it hasn’t been updated in years and thus Ubuntu has dropped it from Ubuntu 18.10 and newer versions.
15.07.2019 · if you do sudo apt-cache search php7.0-* you should get a list of all packages. The zip module should be at the bottom. If it isn't there you might wish to try. sudo add-apt-repository ppa:ondrej/php && sudo apt-get update instead of just add-apt-repository ppa:ondrej/php and see if that makes a difference. Share.
30.08.2017 · How to Use ‘Yum History’ to Find Out Installed or Removed Packages Info If You Appreciate What We Do Here On TecMint, You Should Consider: Linux Server Monitoring Tools
Type sudo apt-get update to get the lists updated. If its the first time you are running this command, it would download something like 20 MB of data. Then type ...