Questions tagged [signature]

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Thunderbird and S/MIME Certificates on smartcards

For my personal needs I'm currently using the platform UBUNTU 22.04.04 LTS and GNOME/WAYLAND. Thunderbird is my personal e-mail and productivity client application, now in it's stable version 115.8.1 (...
PB64's user avatar
  • 11
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146 views

Failing to import new PKCS12 certificate into Evolution Mail

my PKCS12 certificate from my workplace institution expires in a few days. I already got a new one. Yet, I'm failing to import it into Evolution mail. When selecting Edit > Preferences > ...
dick_kickem's user avatar
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0 answers
220 views

How to run PDFbox at terminal

I installed libpdfbox-java as this apt instructions, sudo apt install libpdfbox-java. Now, how to use it? can I run something as ShowSignature myDoc.pdf at terminal? How to run it? Notes If a ...
Peter Krauss's user avatar
1 vote
0 answers
75 views

Proper usage of Digital Signature (DSC) fields nf PDF documents

I'm researching and wanting to use digital signature for my future documents. My Windows installation came with Nitro PDF that I use to build a PDF form with 3 signature fields. I could also set a ...
aeowlian's user avatar
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0 answers
996 views

module verification failed: signature and/or required key missing - tainting kernel

I am install a Wifi kernel module (compat.ko) on Ubuntu 20.04, kernel 5.19. But, the Wifi function not be brought up. The dmesg show below error message. [53.071748] compat: module verification failed:...
Rick's user avatar
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79 views

Can we sign the '.exe' (binary has ELF format)?

We have PE format for Windows, which can be signed and verified using SignTool or verify --> RMB (Binary)-->Digital Signature. Similarly, We have a binary (testFile.exe), which has the ELF ...
Aniket's user avatar
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475 views

Ubuntu 23.04 clamtk: libjson-c.so.3: cannot open shared object file: No such file or directory

I cant use the program for years now. What is wrong here?
jac's user avatar
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0 answers
30 views

Opera repo not signed due to GPG error NO_PUBKEY [duplicate]

I am unable to perform software updates on my new Ubuntu 22.04 installation due to the following error/issue: Warning: GPG error: https://deb.opera.com/opera-stable stable InRelease: The following ...
tonyf's user avatar
  • 2,627
7 votes
3 answers
11k views

Yarn producing GPG Error

I am trying to update my Kubuntu 22.04 LTS. This error occurs: 7 packages can be upgraded. Run 'apt list --upgradable' to see them. W: An error occurred during the signature verification. The ...
feration48's user avatar
0 votes
1 answer
1k views

How to make the default ubuntu repositories trustable again?

So the other day some of my repos(including PPA's) started throwing signature. Every time I try to update my repos I end up with this error sudo apt update Get:1 http://archive.ubuntu.com/ubuntu ...
iamnytik's user avatar
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0 answers
871 views

NICDSign issue: NICDSign client is not installed or running

I am using Ubuntu 22.04. Recently I installed NICDSign and ProxKey Token Tool. Both of them are working.(Nicdsign.list and wdproxkey-token-tool.list etc are in var/lib/dpkg/info) 'NICDSign status: ...
A.G.'s user avatar
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2 votes
0 answers
2k views

Cant boot up. dell_smm_hwmon: unable to get SMM Dell signature

Using XPS 9720 and installed a fresh ubuntu 22.04 LTS over windows. Everything was going fine until i rebooted the system. Now it doesnt boot and shows me the message: dell_smm_hwmon: unable to get ...
ubunbro's user avatar
  • 21
2 votes
0 answers
201 views

How do I sign a PDF file with a CA certificate (.crt)?

I have obtained a CA certificate (a .cert file) issued by Deutsche Bundesdruckerei to digitally sign PDF files. Now I'm wondering how to sign PDF files on Linux in general and Ubuntu in particular. ...
user5950's user avatar
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6 votes
0 answers
4k views

Signing pdf with Okular

I saw that in Okular we can now digitally sign a document. I would like to know the steps from scratch to make this work. At the moment Okular tells me "There are no available signing ...
Sevla's user avatar
  • 61
0 votes
1 answer
622 views

Can't boot with secure boot and with the kernel signed

I want to use Secure Boot with my own keys and with the kernels that I sign. I have gotten Grub to boot, but not with the signed kernel. I get this: "Error: /vmlinuz-5.4.0.91-generic has invalid ...
Albert's user avatar
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1 answer
227 views

16.04.7 LTS: Owncloud installed & un-installed, apt-get update gives Err:11 ... "The following signatures were invalid..."

I would like to fully upgrade this system to the latest LTS. But first I would like to feel the current 16.04.7 LTS is clean. I tried to install Owncloud years ago with limited success and then ...
Kazz's user avatar
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3k views

Why do I get an Invalid signature error using Grub2?

A year or so ago I installed Ubuntu 20.04 LTS on an Acer laptop (SSD system disk) and also made a rescue/safe experimenting FAT32 partition on the internal HDD with the contents of ubuntu-20.04-...
Gus in The Netherlands's user avatar
2 votes
1 answer
411 views

Problem installing ImageMagick 7 using IMEI

I tried to install ImageMagick 7 by IMEI from github: https://github.com/SoftCreatR/imei/ but always had this answer: Signature verification failed! Please check /var/log/imei.log for details. ...
Gazzubuteo's user avatar
55 votes
1 answer
31k views

Invalid signature from repo.skype.com: how can I clear this? [duplicate]

Today I did sudo apt upgrade and then, as a double-check, did sudo apt update. The latter terminated with: Hit:5 http://dl.google.com/linux/chrome/deb stable InRelease ...
James E Keenan's user avatar
24 votes
2 answers
7k views

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] ...
Broadsworde's user avatar
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0 votes
1 answer
486 views

Unable to verify the SHA256 checksum for Focal (20.04) LTS minimal cloud image

I'm attempting to follow the official How to verify your Ubuntu download tutorial to verify the checksum provided with the 20.04 minimal cloud image from here. I'm getting an error from the first ...
Shinies's user avatar
5 votes
1 answer
12k views

How to fix signature key?

I have tried with sudo apt-get update and sudo apt-get upgrade. And i get this error with kubernetes error: I have tried with these following commands below: sudo rm /var/lib/apt/lists/* -vf sudo apt-...
Jonte YH's user avatar
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3 votes
2 answers
2k views

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 ...
Bram's user avatar
  • 2,505
6 votes
2 answers
12k views

Putting Digital Signature on PDF in Ubuntu 20.04

Adobe Acrobat DC on windows support this feature. While snap package adobe acrobat is partially functional on linux, as it logs incompatibility message. So actually I am looking for signing my offer ...
Sayan Dey's user avatar
  • 228
0 votes
2 answers
1k views

How to reinstall a repository pgp key?

I have inadvertently deleted the key that allows for updating of the system, and now when I try updating using sudo apt update I get the following terminal output Get:1 file:/var/lib/preinstalled-pool ...
babelproofreader's user avatar
2 votes
1 answer
1k views

`error: invalid signature.` when trying to boot Ubuntu Core

I'm following instructions on the following page to the letter: https://ubuntu.com/download/kvm . When I run the kvm command, the VM screen appears containing the following error: error: no such ...
qm2k's user avatar
  • 21
7 votes
1 answer
3k views

How to sign your kernel and bootloader?

How to sign your kernel and bootloader? How do I sign my kernel and bootloader? Update (04-Feb-2021) Don't think I made clear what it is that I'm trying to do. I want to do away with OEM keys and only ...
sxkx's user avatar
  • 336
1 vote
0 answers
26 views

Where can I suggest something to Ubuntu devs? [duplicate]

Ubuntu torrent downloads should include the PGP signature and the SHA256SUM. That would guarantee that the PGP signature and the S256SUM (current available at releases.ubuntu.com) aren't tampered.
Luna's user avatar
  • 11
1 vote
1 answer
403 views

Trying to verify signature of Wasabi-1.1.12.3.deb package but it won´t find the file (THE FILE IS THERE)

Ey there, So, i have been trying for hours to install wasabi in Ubuntu without success. Having downloaded the files and following the guide i get to the point of not being able to verify the freaking ...
German Agüevo's user avatar
0 votes
1 answer
376 views

How do I sign a file with my smartcard on Ubuntu 20.10?

I own a latitude E7240 with a smartcard reader (broadcom 5880), running Ubuntu 20.10, and a smartcad with a qualified certificate which I want to usu to digitally sign files. Cardpeek correctly sees ...
quinta's user avatar
  • 561
0 votes
1 answer
538 views

Where can I find Xubuntu 20.04 LTS public key?

This to be spesific, from here.
JJrussel's user avatar
  • 287
0 votes
0 answers
35 views

Does client OS verify packages downloaded from Ubuntu main repository? [duplicate]

Packages seem to be downloaded over http from the Ubuntu main repository, so I was wondering whether the client's OS verifies the packages once downloaded? If so please could someone outline the ...
We'll See's user avatar
2 votes
0 answers
76 views

What is a easy way to sign a Apt package

I built my own linux shell and I built the package I can install it with apt install sturtzshell and it runs like it is supost to when you type sturtz But When I run edited the /etc/apt/sources.list I ...
Nate's user avatar
  • 530
1 vote
1 answer
495 views

In Claws-mail, how to put the signature above quoted text in a reply

In Lubuntu 20.04.1, I'm using Claws Mail 3.17.5 I'd like to be able to click reply and have the cursor position at the top of my message with my signature followed by the quoted text.
Geoffrey Wheeler's user avatar
3 votes
2 answers
6k views

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 ...
Akbarkhon Variskhanov's user avatar
1 vote
1 answer
680 views

Bad signature on verifying the 18.04.5 sha256 checksum

I was following the "How to verify your Ubuntu download" tutorial to verify the ubuntu-18.04.5-desktop-amd64.iso download. After the following command gpg --keyid-format long --verify ...
Ambroz's user avatar
  • 21
4 votes
0 answers
802 views

Having trouble upgrading from 18.04 to 20.04 likely due to lack of valid signature on older unsupported versions [duplicate]

For background, yesterday I tried to upgrade from 18.04 to 20.04 using the itsfoss guide and immediately ran into trouble. My cpu exceeds system requirements, however, it came with Win 10 and I dual-...
Eskmod's user avatar
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1 vote
0 answers
480 views

signature pads (Wacom ?)

Is the signing of sheets on signature pads supported under Ubuntu ? In our shop, this is a widespread use case and it's currently based on Windows Is an equivalent solution available under Ubuntu ? It ...
cato's user avatar
  • 11
0 votes
0 answers
38 views

sound problem / kernel signature

I have an asus zenbook ux430unr, and I would like to use ubuntu on it. I installed ubuntu 20.04 and unfortunately the sound card is unsupported on its kernel version (5.4.0-37-generic). So I installed ...
Borchaniz's user avatar
5 votes
1 answer
3k views

How to remove (adobe) digital signature from PDF

This follows up my previous question: How to check if PDF has been digitally signed?. Just in doubt a document has been digitally signed (e.g. with Adobe), how to remove the signature? In particular, ...
PlasmaBinturong's user avatar
2 votes
1 answer
2k views

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 ...
PlasmaBinturong's user avatar
1 vote
1 answer
399 views

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 ...
dominique-u's user avatar
3 votes
2 answers
13k views

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 ...
user1283068's user avatar
4 votes
3 answers
7k views

How do i generate a certificate to sign pdf electronically?

I'm stuck trying to figure out what kind of certificate I need to create, and how to create it to sign PDF's with LibreOffice. I created a GnuPG key, that did not work. I tried to create a private key ...
Eirik's user avatar
  • 277
1 vote
2 answers
1k views

Signature verification fails for program that I thought I removed. How to remove the program completely?

Here is the output that I get 53 packages can be upgraded. Run 'apt list --upgradable' to see them. W: An error occurred during the signature verification. The repository is not updated and the ...
whitelightning's user avatar
1 vote
1 answer
134 views

How to sign snaps without pushing or pushing it to snap store?

I am creating a snap for my software but until now I've been using --devmode or --dangerous flag to snap install. Now, I would like to sign it, but I can't find something like step-by-step or tutorial ...
Y.B's user avatar
  • 11
0 votes
1 answer
2k views

sbsign: sign a non EFI kernel

The following link explains how to sign a kernel module: https://ubuntu.com/blog/how-to-sign-things-for-secure-boot sbsign --key MOK.priv --cert MOK.pem my_binary.efi --output my_binary.efi.signed ...
Zvi Vered's user avatar
  • 111
11 votes
1 answer
21k views

What exactly is an ext4 signature and why am I removing it?

I was following the steps from an Ask Ubuntu answer (Increase partition size on which Ubuntu is installed?) to enlarge an Ubuntu VM I have and I'm wondering what is actually being removed here: ...
Robert Houghton's user avatar
9 votes
2 answers
1k views

How to digitally sign documents in OpenOffice under Ubuntu?

On Ubuntu 19.04, Libreoffice seems to be there, but when I clicked, all the apps seem to be missing (like the word processor and the spreadsheet). So I first installed OpenOffice. Then I figured out ...
Dov's user avatar
  • 811
0 votes
0 answers
327 views

Unable to mount External HDD missing NTFS and UUID

I need some help! The facts: I was trying to mount a microSD card while my external HDD (Samsung M3 Portable) was plugged and sth went wrong after these mistakes at command line: sudo wipefs --all -...
Leroy's user avatar
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