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Trying to update my 16.04 desktop install, I get package authentication errors for grub (details below). I also get authentication errors when trying to install other packages (sound-juicer and dependencies). This problem is referenced here for multiple versions of Ubuntu:

Why am I getting authentication errors for packages from an Ubuntu repository?

However none of the mentioned solutions works for me. Any suggestions?

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When I run sudo apt-get update, I get the following error:

E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-updates/restricted/dep11/Components-amd64.yml
Could not open file /var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml.gz
- open (13: Permission denied) [IP: 91.189.91.23 80]

When I subsequently run sudo apt-get upgrade, I get the following warning:

WARNING: The following packages cannot be authenticated!
  grub-efi-amd64-signed grub-efi-amd64 grub-efi-amd64-bin grub2-common
  grub-common

1 Answers1

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Problem solved. I misunderstood one of the error messages quoted above, and one of the solutions at the article I referenced did indeed work:

sudo rm /var/lib/apt/lists/partial/*
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install ...

Thank you, WinEunuuchs2Unix. My bad.