# Plesk 12.5 \[Debian 6.0.10\] installation error

**URL:** <https://community.letsencrypt.org/t/plesk-12-5-debian-6-0-10-installation-error/28906>\
**Category:** Help\
**Created:** [March 1, 2017, 8:59am UTC](https://community.letsencrypt.org/t/plesk-12-5-debian-6-0-10-installation-error/28906 "2017-03-01T08:59:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Mattthew](https://avatars.discourse-cdn.com/v4/letter/m/3ab097/32.png) [@Mattthew](https://community.letsencrypt.org/u/Mattthew)\
**Post date:** [March 1, 2017, 8:59am UTC](https://community.letsencrypt.org/t/plesk-12-5-debian-6-0-10-installation-error/28906/1 "2017-03-01T08:59:44Z")

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Hi everybody,

When I am trying to instal Let’s Encrypt on to my Plesk server using the extensions panel I get the following error:

**Fout** : Kan de extensie niet installeren: Executing /opt/psa/admin/plib/modules/letsencrypt/scripts/post-install.php failed: Bootstrapping dependencies for debian squeeze… WARNING: The following packages cannot be authenticated! libffi5 E: There are problems and -y was used without --force-yes

However it seems that let’s Encrypt does get installed because it is added to my extensions panel, but when trying to add a SSL certificate it doesn’t work and I get the following error:

**Fout** : Het installeren van het Let’s Encrypt SSL-certificaat is mislukt: Installation is broken.

I have searched online for some solutions but I cannot find any similar problems…  
Can you guys help out?

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**Author:** ![serverco](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/serverco/32/4251_2.png) [@serverco](https://community.letsencrypt.org/u/serverco)\
**Post date:** [March 1, 2017, 11:15am UTC](https://community.letsencrypt.org/t/plesk-12-5-debian-6-0-10-installation-error/28906/2 "2017-03-01T11:15:18Z")

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I suspect this is because you are using Debian 6, for which the “[End Of Life](https://www.debian.org/News/2016/20160212)” was just over 12 months ago. Others have had similar problems - [Can’t install : 404 Not Found](https://community.letsencrypt.org/t/cant-install-404-not-found/26527)

I’d ideally suggest updating your Operating system. If you want to retain the old OS thoughm then you may be better with one of the[alternative clients](https://letsencrypt.org/docs/client-options/) which don’t have the same dependencies

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**Author:** ![system](https://global.discourse-cdn.com/letsencrypt/original/3X/c/a/ca6c06ea1ea201324bba7048c6841ce60236468d.png) [@system](https://community.letsencrypt.org/u/system)\
**Post date:** [March 31, 2017, 11:15am UTC](https://community.letsencrypt.org/t/plesk-12-5-debian-6-0-10-installation-error/28906/3 "2017-03-31T11:15:29Z")

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