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I have been trying to update apt-get on Ubuntu, but am failing in spite of having viewed a variety of different solutions to similar problems.

I am running the following command...

sudo apt-get update

I have received the following output...

Get:9 http://apt.typesafe.com unicorn InRelease [7,185 B] Err:9 http://apt.typesafe.com unicorn InRelease The following signatures were invalid: D2E3915347209000FA1C06D47CF8D72BE29DF322 ... W: GPG error: http://apt.typesafe.com unicorn InRelease: The following signatures were invalid: D2E3915347209000FA1C06D47CF8D72BE29DF322 E: The repository 'http://apt.typesafe.com unicorn InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.

I've tried re-downloading the key, but still nothing will work.

EDIT: Following installation of the package, I received the same error...

smrk007@Atticus:~/Downloads$ sudo dpkg -i repo-deb-build-0002.deb (Reading database ... 201875 files and directories currently installed.) Preparing to unpack repo-deb-build-0002.deb ... Unpacking typesafe-repo (2.0-build-0003) over (2.0-build-0003) ... Setting up typesafe-repo (2.0-build-0003) ... Warning: The postinst maintainerscript of the package typesafe-repo Warning: seems to use apt-key (provided by apt) without depending on gnupg or gnupg2. Warning: This will BREAK in the future and should be fixed by the package maintainer(s). Note: Check first if apt-key functionality is needed at all - it probably isn't! Warning: apt-key should not be used in scripts (called from postinst maintainerscript of the package typesafe-repo) OK smrk007@Atticus:~/Downloads$ sudo apt-get update Ign:1 https://dl.bintray.com/sbt/debian InRelease Hit:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease Get:3 https://dl.bintray.com/sbt/debian Release [815 B] Hit:4 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease Get:5 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB] Get:6 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB] Hit:7 http://ppa.launchpad.net/webupd8team/java/ubuntu bionic InRelease Get:9 http://apt.typesafe.com unicorn InRelease [7,185 B] Err:9 http://apt.typesafe.com unicorn InRelease The following signatures were invalid: D2E3915347209000FA1C06D47CF8D72BE29DF322

To give some more context, I was trying to install the sbt command line tool for using scala right before this error occurred.

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2
  • You need to both download the key signature and add it ot the apt keyring. They provide a deb package that does it all for you - apt.typesafe.com/repo-deb-build-0002.deb Commented Jun 7, 2018 at 1:49
  • @ivanivan I followed your advice, and am still receiving the same error... Could the key be corrupted? Commented Jun 7, 2018 at 2:00

1 Answer 1

Reset to default
-2

Try this:

sudo rm -rf /var/lib/apt/lists

Basically remove all the lists folders from the apt directory.
Add list directory with below command:

sudo mkdir /var/lib/apt/lists

Then try the below command:

sudo apt-get update
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1
  • 2
    This also deletes the gpg certificates. You do not want to do that. This will not improve the OP situation, quite by the contrary. Commented Jul 8, 2018 at 12:47

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