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I do not know how, but I managed to mess up apt-get. Executing 

sudo su
apt-get update

I get errors like the following 

W: http://security.debian.org/dists/stretch/updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
W: GPG error: http://security.debian.org stretch/updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9D6D8F6BC857C906 NO_PUBKEY 8B48AD6246925553
W: The repository 'http://security.debian.org stretch/updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.

for the repositories:

http://deb.debian.org/debian stretch-updates InRelease
http://deb.debian.org/debian stretch-proposed-updates InRelease
http://deb.debian.org/debian stretch Release

I understand that there are some keys missing and I tried to create them with 

gpg --keyserver keyring.debian.org --recv-keys 8B48AD6246925553

but as a reply I got

gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

Additionally I have another problem with http://deb.debian.org/debian stretch/main Translation-en:

E: Failed to fetch http://deb.debian.org/debian/dists/stretch/main/i18n/Translation-en  BZ2_bzread: /var/lib/apt/lists/partial/deb.debian.org_debian_dists_stretch_main_i18n_Translation-en.bz2 Read error (-5: DATA_ERROR_MAGIC)

which seems to have to do with the Zip-format!? No idea what I did.

Any ideas/hints how to fix my two problems?

Cheers, Christian

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2

The simplest way to fix this is to manually download the debian-archive-keyring package and install that, then run apt update again. You’ll also need to restore the permissions on /etc/apt/trusted.gpg:

sudo chmod 444 /etc/apt/trusted.gpg

The Translations problem is a bad file on the servers, there’s nothing you can do about that.

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7
  • Thanks for your comments. I downloaded the debian-archive-keyring package and installed it with sudo dpkg -i debian-archive-keyring_2017.5_all.deb, but apt update shows the same mistake: W: GPG error: deb.debian.org/debian stretch-proposed-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 – Christian Lomp Jun 18 '19 at 14:33
  • Oh, I missed the permission error, see my update. – Stephen Kitt Jun 18 '19 at 14:44
  • I did this, but the error persists. The size of my trusted.gpg is only 32 bytes, so I believe it is empty. If I do apt-key list I do not see any keys. Also the directory trusted.gpg.d is empty ? Any idea how to restore this? – Christian Lomp Jun 18 '19 at 14:53
  • Re-installing debian-archive-keyring is supposed to restore the contents of the trusted.gpg.d directory. – Stephen Kitt Jun 18 '19 at 14:54
  • Thanks for trying to help, but in either way doing sudo apt-get install --reinstall debian-archive-keyring or via dpkg from the downloaded deb-file, the directory /etc/apt/trusted.gpg.d stays empty. Apt-get lets me reinstall the debian-archive-keyring, but warns that the package cannot be authenticated. – Christian Lomp Jun 18 '19 at 14:58

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