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On Ubuntu 18:04 Bionic (installed as a Singularity container) I issue 

apt-get install okular

and I get the message "E: Unable to locate package okular".

Why? Is okular not in the apt repositories any more? How do I install it then?

halloleo
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1 Answers1

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A possible fix would be to use the following command to add the "universe" repository:

sudo add-apt-repository universe

Or, if this returns an error, try:

sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) universe"

If none of these work, then inside the terminal, type:

sudo apt-get install software-properties-common

and repeat the first command.

Then finally update by typing:

sudo apt update

Then try installing again by:

sudo apt-get install okular

Hopefully this works out.

Purhan
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