It's advisable to run that before installing or upgrading packages from the command line. ![]() The first command updates information about what packages are available in what versions and from what software sources. Or you can install it by running these commands: sudo apt-get update In this particular situation, you may be able to install flex by clicking here: See Installing Software for more information. rpm package, you should use alien to make a. ![]() deb packages-if you find you actually need to install an. dpkg (or its graphical frontend, gdebi) should be used to for this purpose on Ubuntu. The lower-level tool on Red Hat based systems, for installing a package from a specific package file, is rpm. The above commands are what you'd use instead. Yum is primarily used on Red Hat based systems (including Fedora, Red Hat Enterprise Linux, and derivatives of those). Usually you should install software with Ubuntu's package manager, APT (using apt-get, or the alternative, aptitude), or with one of its graphical frontends (like the Ubuntu Software Center or the Synaptic Package Manager). It is provided for very special circumstances only. ![]() ![]() Assuming you are using Ubuntu, you should usually not attempt to install packages with yum.
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