Couldn't find the xsel binary and fallback didn't work. On Debian/Ubuntu you can install xsel with: sudo apt install xsel

[iuriigrynykha]

I've encountered such an issue upon running the tests in Jenkins on a remote Linux machine.

After sudo apt install xsel the following error message is displayed

"Both xsel and fallback failed".

Can you help me to solve this issue, please?

[tom-james-watson]

If you manage to log the underling error you'll likely see something like the following:

xsel: Can't open display: (null)
      : Inappropriate ioctl for device

It looks like the library doesn't work in a headless environment.

I'm not sure about Jenkins, but on GitHub Actions you can use this action - https://github.com/marketplace/actions/gabrielbb-xvfb-action - to provide a virtual display whilst running the tests.

[tom-james-watson]

You can also use xvfb-run from the xvfb package.

e.g. on circleci:

- run:                                                                    
    name: Run Tests                                                       
    command: xvfb-run npm t

[esatterwhite]

I just ran into this problem as well on jenkins. Not sure if it is a jenkins specific thing as this build run in docker containers.

However, it works find on Node 12 and 14. But fails with this error on node 15

[github0013]

I solved this like this #65

[kadistudio]

error = new Error('Couldn't find the xsel binary and fallback didn't work. On Debian/Ubuntu you can install xsel with: sudo apt install xsel');

I also encounter this error when i try to host my Discord Bot using Heroku, when using my own terminal node . everything is fine. btw im using 2.3.0 version because the 3.0.0 gives me error

[sankalpguptasymphony]

@iuriigrynykha Were you able to solve this problem?

"Both xsel and fallback failed"

[pgibler]

Also having this issue.