Apt

I was trying to build coreutils the other day and kept running into an error with docbooks. I’d initially figured out I was missing the docbook and docbook-xsl packages (fairly obvious given it said it couldn’t find it…), but having installed them, I then got this more cryptic error: failed to load external entity "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" Some searching and trawling through forum posts led me to try installing docbook-xml — this solved the problem. ...

This’ll be a short post, more for my own reference than anything else! When running sudo apt update, I got the following error: Err:8 https://dl.yarnpkg.com/debian stable InRelease The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging <[email protected]> [...] W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://dl.yarnpkg.com/debian stable InRelease: The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging <[email protected]> W: Failed to fetch https://dl.yarnpkg.com/debian/dists/stable/InRelease The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging <[email protected]> W: Some index files failed to download. They have been ignored, or old ones used instead. Googling this returns a mixture of results and fixes, but the one I’ve found works the majority of the time is: sudo apt-key adv --refresh-keys --keyserver keyserver.ubuntu.com Running sudo apt update again then works — yay! 🎉