I have tested further installing the Chromium snap in Kubuntu and Xubuntu. Both allow me to install extensions.
My Ubuntu install still has the issue. ~/snap/chromium/current/ has a symbolic link to ~/snap/chromium/861 which is empty All folders under ~/snap/chromium/ (861, 881, and common) are empty Permissions are 755 to ~/snap/chromium/861, ~/snap/chromium/881, and ~/snap/chromium/common and 777 to ~/snap/chromium/current -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to chromium-browser in Ubuntu. https://bugs.launchpad.net/bugs/1848090 Title: [snap] Unable to install Extensions Status in chromium-browser package in Ubuntu: Incomplete Bug description: When attempting to install an extension in the Snap version of Chromium I'm presented with an error message "An error has occurred Could not create download directory" Steps to recreate: Menu > More tools > Extensions Select any extension to install To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1848090/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp