I want to install JDK 8, but during the execution of this command

sudo -E add-apt-repository ppa:webupd8team/java

I got this error

gpg: keybox '/tmp/tmplvej9x_g/pubring.gpg' created
gpg: keyserver receive failed: No keyserver available

What a have to do? I'm new in linux.

Nota: I have proxy in my network and I did some configurations



I asked the same question some time ago but got only one response which didn't work for me, see if it works for you.
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