Your APT configuration is corrupt.

[philpep54]

Hey there, i run a linuxMint virtual machine from virtualBox and recently i changed the computer hostname in

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/etc/hostname

and

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/etc/hosts

. Since then i have been having trouble doing any update with the

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sudo apt-get update

or from the Update Manager. I tried running

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sudo rm /var/lib/apt/lists/* -vf
sudo apt-get clean
sudo apt-get update

but that didn't work either. I'm also pretty new to linux so i dont really know where to look. Thank you in advance !

[Cosmo.]

How does hosts look now?
Did you do this command after changing the 2 files:

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hostname -F /etc/hostname

Did you reboot?