cache error while installing updates
When the install updates button is clicked, it tries to pull packages from the repository by looking at the latest downloaded cache file. If the cache of the repository has been updated after the last downloaded cache file and we have the old one, it gives an error that the packages could not be downloaded. Therefore, if the cache update (apt update) can be performed one last time when the install updates button is clicked, this error will be resolved.
for example; firefox version in last automatic downloaded repo cache (91) firefox version in the repo (91.1) when the install updates button is clicked, it tries to download 91 from repo and returning 404.