Sometimes when I run a terminal command that updates or installs software, the transaction displays a curl error, but the operation still finishes successfully. It does not happen every time, though the red error text makes me worry that something failed, was compromised, or left my system in an inconsistent state. I'm still fairly new to Linux, so I'd like to understand whether this is ordinary terminal noise or something I should investigate. What do these errors usually mean, and when should I be concerned?
2 Answers
It depends on the exact curl error, but a common cause is that the package manager cannot reach one mirror or download server. It may automatically try another mirror and complete the transaction successfully. If the update finishes and the package manager reports success, it usually is not a security problem. However, repeated failures or errors saying that packages could not be downloaded or installed may indicate a bad mirror list, DNS or network trouble, or another issue worth fixing.
For software installation, it is generally safest to use your distribution’s official repositories and package manager. Many systems also provide a graphical software center, and Flatpak applications can be installed through a trusted Flatpak repository. Avoid downloading random installation commands or mixing packages from unrelated distributions and third-party repositories, since that can create dependency and maintenance problems.
Having lots of software installed by itself does not create a broken system. The bigger risk is mixing packages from different distribution releases or adding third-party repositories that replace core system components. That is what can lead to dependency conflicts and an unstable setup.