# Validate signature
**URL:** https://discourse.appimage.org/t/validate-signature/2258
**Category:** Apps
**Created:** [February 2, 2021, 5:31pm UTC](https://discourse.appimage.org/t/validate-signature/2258 "2021-02-02T17:31:59Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@gonzaloamadio](https://discourse.appimage.org/u/gonzaloamadio)
#### Post date: [February 2, 2021, 5:32pm UTC](https://discourse.appimage.org/t/validate-signature/2258/1 "2021-02-02T17:32:00Z")
Hi! , I am trying to validate a signed app image. As I read in the README, to validate I should build the system in a Centos 6 or Ubuntu 14. But the build can be used in later releases.
Can you provide a download link to the validate script? Will that work on ubuntu only?
Thank you!
---
### Author:  [@gonzaloamadio](https://discourse.appimage.org/u/gonzaloamadio)
#### Post date: [February 2, 2021, 6:04pm UTC](https://discourse.appimage.org/t/validate-signature/2258/2 "2021-02-02T18:04:25Z")
So, what I did is :
```
git clone https://github.com/AppImage/AppImageKit
cd AppImageKit
env ARCH=x86_64 bash ci/build.sh
```
But when I try to execute
`./validate myapp.AppImage`
I got this error:
`./tmp/AppImageKit/out/validate: error while loading shared libraries: libssl.so.10: cannot open shared object file: No such file or directory`
I tried this, but nothing:
[[libssl.so.10: cannot open shared object file: No such file or directory - Ask Ubuntu](https://askubuntu.com/questions/339364/libssl-so-10-cannot-open-shared-object-file-no-such-file-or-directory)]([https://symbolik](https://symbolik) link for libs)
My S.O :
```
└──> lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic
```
Any help?
---
### Author:  [@probono](https://discourse.appimage.org/u/probono)
#### Post date: [February 13, 2021, 5:11pm UTC](https://discourse.appimage.org/t/validate-signature/2258/3 "2021-02-13T17:11:47Z")
What happens if you build and run `validate` on Ubuntu 16.04?
---
### Author:  [@gonzaloamadio](https://discourse.appimage.org/u/gonzaloamadio)
#### Post date: [February 23, 2021, 6:02pm UTC](https://discourse.appimage.org/t/validate-signature/2258/4 "2021-02-23T18:02:20Z")
I downloaded an ubuntu 16 virtual box image, and tried it:
```
$ git clone https://github.com/AppImage/AppImageKit
$ cd AppImageKit
$ sudo env ARCH=x86_64 bash ci/build.sh
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /opt/rh/devtoolset-8/root/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at lib/CMakeLists.txt:1 (add_subdirectory):
The source directory
/ws/lib/libappimage
does not contain a CMakeLists.txt file.
CMake Error at CMakeLists.txt:71 (include):
include could not find load file:
lib/libappimage/cmake/tools.cmake
CMake Error at cmake/dependencies.cmake:5 (include):
include could not find load file:
/ws/lib/libappimage/cmake/scripts.cmake
Call Stack (most recent call first):
CMakeLists.txt:72 (include)
CMake Error at cmake/dependencies.cmake:11 (import_pkgconfig_target):
Unknown CMake command "import_pkgconfig_target".
Call Stack (most recent call first):
CMakeLists.txt:72 (include)
-- Configuring incomplete, errors occurred!
See also "/tmp/AppImageKit-build-VGOVjb/CMakeFiles/CMakeOutput.log".
+ cleanup
+ '[' -d /tmp/AppImageKit-build-VGOVjb ']'
+ rm -rf /tmp/AppImageKit-build-VGOVjb
```
---
### Author:  [@probono](https://discourse.appimage.org/u/probono)
#### Post date: [August 3, 2021, 6:21am UTC](https://discourse.appimage.org/t/validate-signature/2258/5 "2021-08-03T06:21:58Z")
Possibly you need to get a newer CMake from [Download | CMake](https://cmake.org/download/). This is one of the reasons I don’t completely like CMake - it frequently seems to need newer versions than what is available on the oldest LTS releases we tend to use.