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Whenever I try to install any software from ubuntu software centre, I receive a message saying "cannot do that"enter image description here

click on the above link to see the image that I get

When I choose to download it from terminal it says:

E: Unable to parse package file /var/lib/apt/lists/ppa.launchpad.net_snwh_pulp_ubuntu_dists_xenial_InRelease (1)
E: The package lists or status file could not be parsed or opened.

What do I suppose to do and first of all please tell me why this error is occurring?

d a i s y
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pranav mishra
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  • refer to this , it seems u too have a 'classic' snap issue https://askubuntu.com/questions/923021/when-i-try-to-install-vscode-snapd-returns-error-code-400 – aradhyamathur Oct 15 '17 at 08:37

2 Answers2

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This error is usually caused by trying to install software that is packaged as a "classic snap" rather than a normal snap or a deb package. Classic snaps cannot be installed using the Ubuntu Software application due to the way they are packaged (why they even show up in Ubuntu Software is a mystery to me). You can install them using the snap command-line tool. First, search for the app (i.e. for slack):

snap search slack

The notes column will say classic for classic snaps. These are the kind that must be installed using the command line:

sudo snap install slack

this will warn you about the security risks of a classic snap and advise you to append --classic if you understand them:

sudo snap install slack --classic

Sources:

mltsy
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Run this command in terminal

sudo rm -r /var/lib/apt/lists/*

And Then 

sudo apt update

I think your /var/lib/apt/lists/ files are corrupted So You Can delete them to regenerate them.