Comando não funciona

root@junior-Aspire-F5-573G:/home/junior# sudo add-apt-repository ppa:graphics-drivers/ppa
Você está prestes a adicionar o seguinte PPA:
Fresh drivers from upstream, currently shipping Nvidia.

## Current Status

Current long-lived branch release: `nvidia-430` (430.40)
Dropped support for Fermi series (https://nvidia.custhelp.com/app/answers/detail/a_id/4656)

Old long-lived branch release: `nvidia-390` (390.129)

For GF1xx GPUs use `nvidia-390` (390.129)
For G8x, G9x and GT2xx GPUs use `nvidia-340` (340.107)
For NV4x and G7x GPUs use `nvidia-304` (304.137) End-Of-Life!

Support timeframes for Unix legacy GPU releases:
https://nvidia.custhelp.com/app/answers/detail/a_id/3142

## What we're working on right now:

- Normal driver updates
- Help Wanted: Mesa Updates for Intel/AMD users, ping us if you want to help do this work, we're shorthanded.

## WARNINGS:

This PPA is currently in testing, you should be experienced with packaging before you dive in here:

Volunteers welcome!

### How you can help:

## Install PTS and benchmark your gear:

sudo apt-get install phoronix-test-suite

Run the benchmark:

phoronix-test-suite default-benchmark openarena xonotic tesseract gputest unigine-valley

and then say yes when it asks you to submit your results to openbechmarking.org. Then grab a cup of coffee, it takes a bit for the benchmarks to run. Depending on the version of Ubuntu you're using it might preferable for you to grabs PTS from upstream directly: http://www.phoronix-test-suite.com/?k=downloads

## Share your results with the community:

Post a link to your results (or any other feedback to): https://launchpad.net/~graphics-drivers-testers

Remember to rerun and resubmit the benchmarks after driver upgrades, this will allow us to gather a bunch of data on performance that we can share with everybody.

If you run into old documentation referring to other PPAs, you can help us by consolidating references to this PPA.

If someone wants to go ahead and start prototyping on `software-properties-gtk` on what the GUI should look like, please start hacking!

## Help us Help You!

We use the donation funds to get the developers hardware to test and upload these drivers, please consider donating to the "community" slider on the donation page if you're loving this PPA:

http://www.ubuntu.com/download/desktop/contribute
Mais informações: https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa
Pressione Enter para continuar ou Ctrl+C para cancelar

Executing: /tmp/apt-key-gpghome.ZO1njvwNhX/gpg.1.sh --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys 2388FF3BE10A76F638F80723FCAE110B1118213C
gpg: Recebimento de informação do keyserver falhou: Erro geral
root@junior-Aspire-F5-573G:/home/junior#

Qual a solução?