Questions tagged [signature]
The signature tag has no usage guidance.
20
questions
50
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4
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Google Chrome PPA upgrade invalid signature
When running:
sudo apt-get update && sudo apt-get dist-upgrade
I got this output:
Ign http://security.ubuntu.com utopic-security InRelease
Ign http://gb.archive.ubuntu.com utopic InRelease ...
19
votes
4
answers
33k
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How do I make a digital certificate available to LibreOffice Writer for digital signatures?
I obtained a client certificate from CAcert through Firefox. I want to use that certificate to sign a document created with LibreOffice Writer.
In Writer, I click File > Digital Signatures... to ...
58
votes
13
answers
138k
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How do I digitally sign a PDF with a S/MIME certificate?
I have already acquired a S/MIME certificate (a .p12 file) issued by an authority. Using it in Writer, I can digitally sign documents by following this procedure : How do I make a digital certificate ...
24
votes
2
answers
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Why isn't `apt upgrade` getting a new software key signature for skype?
After a recent apt update && apt full-upgrade I started getting the following error when running apt full-upgrade subsequently:
Get:4 https://repo.skype.com/deb stable InRelease [4,502 B] ...
17
votes
2
answers
8k
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How to sign files with Ubuntu command-line tools and my own keys?
I want to sign some Python code files I wrote, because they are plug-in modules for one of my projects. For distributing it, I want that the user can be sure a plug-in is verified and safe (because ...
8
votes
4
answers
40k
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GPG Invalid Signature
I am having problems with the following (in an attempt to remove hyperlinks, I have removed one of the "/" from the addresses):
W: GPG error: http://archive.ubuntu.com oneiric Release: The following ...
3
votes
2
answers
2k
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What is wrong with ddebs.ubuntu.com
Did something expire that should not have?
I am using debug symbols on my Ubuntu 20.10 install, and now I get this when I run the apt-get update command.
W: An error occurred during the signature ...
2
votes
1
answer
3k
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Ubuntu 18.04 - after upgrade - Display/PKCS#7 signature error
After upgrading from 17.10 to 18.04, anytime I try and open Ubuntu I am getting the following errors (which are found in my kern.log as well)
Sep 28 15:06:12 aram-UX330UAK kernel: [ 15.056052] PKCS#...
2
votes
1
answer
4k
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Ubuntu Extras keyring error [duplicate]
Recently I got lots of GPG errors and tried the following methods at various stages:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3E5C1192
sudo apt-get install -reinstall ubuntu-...
25
votes
1
answer
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How can I validate a pdf's digital signature with evince?
A while ago I received a PDF file that was digitally signed.
The Document Viewer (Evince) shows me that the digital signature was not validated.
How do I add the file's digital signature to evince ...
16
votes
2
answers
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how do you create a "signed" deb package
I want to create a number of deb packages, but I don't know how "signing" packages works. So I was wondering how to create a signed deb package.
7
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4
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Why does Empathy say my connection is untrusted?
Today when I opened Empathy on Ubuntu 10.10 I got this unusual error box. I have never got this warning about an untrusted connection before.
What should I do? Is it a security risk if I continue ...
6
votes
1
answer
2k
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How does Secure Boot actually work?
I'm playing with GRUB2, SecureBoot and Kernel Signing and I think I found a possible bug in my Secure Boot, but I want to check my understanding of these processes first.
I know that when Secure Boot ...
3
votes
2
answers
13k
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How to handle "invalid signature" in apt-get
Following an update to Focal, I had to revisit /etc/apt/sources* to update my third party repositories.
One of the reposities is for the Yorba PPA at: https://launchpad.net/~yorba/+archive/ubuntu/ppa
...
3
votes
2
answers
6k
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What exactly does a BAD signature mean?
About 16 hours ago I downloaded the Ubuntu 18.04.5 image from releases.ubuntu.com alongside its checksum file and GnuPG signature. Verifying the checksum file using the signature results in a BAD ...
3
votes
1
answer
1k
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LibreOffice fails to access my personal certificate
Recently, I updated my personal certificate. Then I wanted to sign a libreoffice document.
I followed the instructions from Part 1 to Part 4. Both Thunderbird and Firefox are displaying the correct, ...
2
votes
1
answer
409
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How to publish your key used to sign deb packages so you will be able to use your repository from any machine?
I am looking for a solution that would prevent me from seeing things like:
W: GPG error: http://updates.example.com lenny Release: The following signatures couldn't be verified because the public key ...
2
votes
1
answer
2k
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How to check if PDF document has been signed (probably with Adobe)?
I'm on Xubuntu 18.04.4 LTS. I received a document, then forwarded it to other people who should be able to modify it. However digital signatures might prevent that.
How do I check if Adobe was used to ...
1
vote
1
answer
397
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Digital signing with qdigidoc4 (Estonian ID card software) under Ubuntu 20.04
When trying to use qdigidoc4 (version 4.2.4.71) on Ubuntu 20.04, and trying to sign a container, signing fails (both with ID card and Mobile ID) and I get the following message:
ASiC_E.cpp:347 Failed ...
1
vote
1
answer
6k
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Generating, Signing and Verifying Digital Certificates
So here's a question from my project.
In this task, we will use OpenSSL to generate digital signatures. Please prepare a file (example.txt) of any size. Also prepare an RSA public/private key pair. ...