# Broken apt update?

**URL:** <https://forums.developer.nvidia.com/t/broken-apt-update/354897>\
**Category:** DGX Spark / GB10\
**Created:** [December 16, 2025, 7:17pm UTC](https://forums.developer.nvidia.com/t/broken-apt-update/354897 "2025-12-16T19:17:18Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![DannyTup](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/dannytup/32/450509_2.png) [@DannyTup](https://forums.developer.nvidia.com/u/DannyTup)\
**Post date:** [December 16, 2025, 7:47pm UTC](https://forums.developer.nvidia.com/t/broken-apt-update/354897/2 "2025-12-16T19:47:36Z")

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This is a known issue, there are details and a workaround posted here:

> [@DGX Spark apt update failure (EXPKEYSIG)](https://forums.developer.nvidia.com/t/dgx-spark-apt-update-failure-expkeysig/354539):
>
> We’re aware of an issue where sudo apt update fails on DGX Spark due to an expired NVIDIA Workbench repo GPG key: The following signatures were invalid: EXPKEYSIG CD63F8B21266DE3C Workaround Run on the Spark system: curl -fsSL https://workbench.download.nvidia.com/stable/linux/gpgkey | \ gpg --dearmor | sudo tee /usr/share/keyrings/ai-workbench-desktop-key.gpg \> /dev/null sudo apt update An automated fix is in progress. This manual step should unblock in the meantime. Please reply here…

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_[View the full topic](https://forums.developer.nvidia.com/t/broken-apt-update/354897)._