I am trying to download and install Flex and Bison for use in a closed environment on a new install of ubuntu. I have searched and can not seem to figure out exactly WHAT I need to download.
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On a system with internet connectivity, download the flex and bison packages:
apt-get download flex bison
Bring those deb files (flex_2.6.0-11_amd64.deb and bison_2%3a3.0.4.dfsg-1_amd64.deb) to your closed system. Install them from a terminal, whose current directory is the location of the deb files:
sudo dpkg -i flex_2.6.0-11_amd64.deb
sudo dpkg -i bison_2%3a3.0.4.dfsg-1_amd64.deb
If you had tried to use Nautilus to install the package, the "Open with Software Install" R. click menu choice does require a network connection.

ubfan1
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flex
andbison
) but just not an Internet connection, another question is similar and offers several options. – Chai T. Rex Feb 28 '17 at 22:02