(1) Network works fine
(2) In Software Center, search doesn't work, search anything gives no result.
(3) Chromium install failed: E: Could not get lock /var/lib/dpkg/lock-frontend - open...
Then I've installed Chromium successfully from command line.
Is there a way to install application from the Software Center (not command line)? How to fix the Software Center problems?
After reboot Chromium can be removed and reinstalled in Software Center, but search still doesn't work, and update doesn't work as Unable to download updates from "extensions.gnome.org"... Failed to download https://extensions.gnome.org//static/extensions.json