Questions tagged [signature]

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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 ...
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1answer
51 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 ...
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0answers
23 views

Check USB firmware signature

To prevent badusb attacks I use usbguard on my machine and use USB-Sticks from kanguru which do not allow firmware modification. But for no-name usb devices like keyboards etc ... Is there a way in ...
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0answers
51 views

Including image files in signatures using thunderbird

How do I include the image with the html for a signature file with Thunderbird? Here, the html is in an external file. Following generic directions, I saved an e-mail to file for reference. After ...
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0answers
331 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-...
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1answer
102 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. ...
48
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1answer
17k 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 ...
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2answers
6k 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] ...
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0answers
160 views

how to disable secure boot in crouton

I am having problems with ubuntu focal fossal XFCE enviorment, more specific Crouton. And if you don't know what a crouton is it makes a chroot inside chrome os. So i am basicly running a chroot ...
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1answer
94 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 ...
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1answer
951 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-...
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2answers
498 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 ...
2
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1answer
367 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 ...
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2answers
186 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 ...
1
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1answer
384 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 ...
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0answers
1k 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 ...
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0answers
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.
1
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1answer
113 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 ...
0
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1answer
148 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 ...
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1answer
173 views

Where can I find Xubuntu 20.04 LTS public key?

This to be spesific, from here.
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0answers
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 ...
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0answers
35 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 ...
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1answer
273 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.
2
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1answer
2k 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 ...
1
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1answer
448 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 ...
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0answers
504 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-...
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0answers
188 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 ...
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0answers
33 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 ...
5
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1answer
825 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, ...
2
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1answer
1k 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 ...
1
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1answer
289 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 ...
2
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2answers
5k 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 ...
2
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2answers
2k 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 ...
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2answers
608 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 ...
1
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1answer
82 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 ...
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1answer
682 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 ...
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1answer
9k 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: ...
8
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1answer
495 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 ...
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0answers
170 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 -...
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0answers
68 views

How to specify which public key file to use with a repository?

I am trying to set up a repo on local file system on ubuntu. I will use that repo only during the installation of my product & then remove the repo. Now I want to have my deb packages signed &...
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2answers
2k views

Dell Canonical repository is not signed (GPG error)

With the update to 19.04 my dell repository is not working as it is marked as not signed. This is the error I get: Ign:11 http://dell.archive.canonical.com/updates xenial-dell Release.gpg W: GPG ...
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0answers
45 views

How to enlist all invalid signatures?

My machine keeps prompting of "Invalid Signatures Found" at every single boot. I knew of two kernel modules that had invalid signatures, the NVIDIA display driver module and the vboxdrv module, and I ...
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0answers
1k views

PKCS#7 signature not signed with a trusted key

Hi i just installed ubuntu 18.10 first boot worked fine but after I reboot black screen with this message keep comming up PKCS#7 signature not signed with a trusted key I have no idea what this ...
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0answers
643 views

PGP signature isn't selected when trying to sign during export of PDF-file in LibreOffice Writer

I have asked the following question on ask.libreoffice.org but nobody answered: I have an Enigmail PGP signature that I use in Thunderbird under Ubuntu Linux. In Libre Office I can use it to sign (...
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2answers
9k views

Boot Message: pkcs #7 signature not signed with a trusted key

It seems that this bug is an old one, and a really persistent one, as has been reported by several users. It was also reported that the bug has been resolved in patch updates, but, somehow, I am still ...
3
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1answer
934 views

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, ...
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1answer
2k views

Does DPKG support for verifying GPG signature for Debian package files?

I am trying to enable the GPG verification in /etc/dpkg/dpkg.cfg by remove no-debsig in this configuration file: .# Do not enable debsig-verify by default; since the distribution is not using ...
5
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1answer
509 views

openprinting key for ubuntu 18

I'm trying to add openprinting repo (http://www.openprinting.org/download/printdriver/debian lsb3.2) to my computer for some reason the key I downloaded (Release.gpg) is not working. I keep getting ...
2
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1answer
3k views

How to get pgp's scdaemon on ubuntu 18.04?

How to get pgp's scdaemon on ubuntu 18.04? It seems that for older versions it is present, but how should I install for newer ones? PS: I'm trying to use gpg --edit-card
2
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1answer
3k views

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#...