Error updating emacs packages: Failed to download ‘gnu’ archive
Looks like a bug in your version of Emacs. You can probably circumvent it by setting package-check-signature to nil.
elpa
Emacs behind HTTP proxy
For w3m, this setting has worked for me: (setq url-proxy-services ‘((“no_proxy” . “work\\.com”) (“http” . “proxy.work.com:911”)))
How to rebuild ELPA packages after upgrade of Emacs
You do not need to re-install all packages. The packages itself are likely fine, however, they need to be re-compiled, because Emacs Lisp byte code is generally not compatible across major versions. To re-compile all packages, type M-: (byte-recompile-directory package-user-dir nil ‘force). After restarting Emacs, packages should work fine again.
Updating packages in Emacs
In order to automatically update the list of packages, only if there is no package list already, use the following: (when (not package-archive-contents) (package-refresh-contents)) In order to update all installed packages, type package-list-packages, which will take you to the *Packages* buffer (and also update the list of packages), and then type U x. package-refresh-contents unconditionally … Read more