"The tmp folder is not writable"

Why it happens

Joomla uses its temp folder for uploads, extension installs and updates. If the path in Global Configuration is wrong (often after a move) or the folder isn't writable, installs and updates fail.

Fix it

1. Go to System → Global Configuration → Server and set Path to Temp Folder to your site's folder plus /tmp.
2. Make sure the tmp folder exists and is writable (755).
3. Save, then try the install or update again.

Good to know

• If your host uses open_basedir, the temp folder must be inside the allowed paths; your site's own tmp folder always is.