Data usage /network traffic monitoring

Looking for a way to see how much internet data each application is using. Currently my Librem 15 running pureos is hemorrhaging data.

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System manager and sort by network, if you want more detail use nethogs, just type


Into there terminal

thanks for your reply. I could find System monitor (but not manager) and under the resources tab > network history, I am able to see total MB in and out.
Typing nethogs into terminal produced this error -
Could not find the database of available applications, run update-command-not-found as root to fix this

Running update-command-not-found produced the same error.

Advice on how to fix this would be appreciated.

There’s the git for it though it should be a preinstalled debian package