When I start up Ubuntu on my Toshiba Chromebook I try typing in the search bar of the internet browsing app "Konqueror" but nothing happens.
The easiest answer to your problems is probably to install a more developed and stable browser such as chromium...
Installing Chromium in the terminal
As you cannot access a Web-browser, I suggest installing Chromium in the terminal... You can accomplish this by simply running the following commands:
sudo apt update sudo apt install chromium-browser
Then simply launch Chromium and hopefully your issues are resolved, if not please leave a comment.