# Problème Nexcloud upgrade (20.0.8~ynh1 à 21.0.2~ynh1) **URL:** \ **Category:** Support apps\ **Tags:** french\ **Created:** [July 5, 2021, 6:56pm UTC](https://forum.yunohost.org/t/probleme-nexcloud-upgrade-20-0-8-ynh1-a-21-0-2-ynh1/16467 "2021-07-05T18:56:03Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![ppr](https://forum.yunohost.org/letter_avatar_proxy/v4/letter/p/8c91f0/32.png) [@ppr](https://forum.yunohost.org/u/ppr)\ **Post date:** [July 6, 2021, 1:55am UTC](https://forum.yunohost.org/t/probleme-nexcloud-upgrade-20-0-8-ynh1-a-21-0-2-ynh1/16467/2 "2021-07-06T01:55:28Z")
Bonjour, Je ne sais pas si ça a à voir mais il y a une erreur de mise à jour relative au dépôt `sury` : > **Résumé** > > 2021-07-05 21:03:33,838: DEBUG - Err:2 [Index of /php/](https://packages.sury.org/php) buster InRelease > 2021-07-05 21:03:33,838: DEBUG - The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 [DEB.SURY.ORG](http://DEB.SURY.ORG) Automatic Signing Key [deb@sury.org](mailto:deb@sury.org) > 2021-07-05 21:03:34,874: DEBUG - Reading package lists… > 2021-07-05 21:03:34,917: WARNING - W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: [Index of /php/](https://packages.sury.org/php) buster InRelease: The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 [DEB.SURY.ORG](http://DEB.SURY.ORG) Automatic Signing Key [deb@sury.org](mailto:deb@sury.org) > 2021-07-05 21:03:34,918: WARNING - W: Failed to fetch [https://packages.sury.org/php/dists/buster/InRelease](https://packages.sury.org/php/dists/buster/InRelease) The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 [DEB.SURY.ORG](http://DEB.SURY.ORG) Automatic Signing Key [deb@sury.org](mailto:deb@sury.org) > 2021-07-05 21:03:34,918: WARNING - W: Some index files failed to download. They have been ignored, or old ones used instead. Du coup il faudrait appliquer cette solution en ligne de commande : > sudo apt-key del 95BD4743 > wget -nv -O - [https://packages.sury.org/php/apt.gpg](https://packages.sury.org/php/apt.gpg) | sudo apt-key add - Source : > [@Recurring issues during system updates these days, and how to fix them](https://forum.yunohost.org/t/recurring-issues-during-system-updates-these-days-and-how-to-fix-them/15266): > > Hi there! We noticed many people have recurring (minor) issues these days while trying to upgrade their servers, for reasons external to the Yunohost project. Unfortunately, it’s not easy from our side to provide an automatic mecanism that magically solves this, and you may need to run these commands to fix the situation. 1. Downgrading libssl packages For some reason, some libssl packages need to be downgraded (maybe related to some stories with sury). During upgrade attempts, you will see m… ppr --- _[View the full topic](https://forum.yunohost.org/t/probleme-nexcloud-upgrade-20-0-8-ynh1-a-21-0-2-ynh1/16467)._