@ukphil Well, not about Tor Browser as in the title, but VPN problems as mentioned here. The UBPorts/Ubuntu Touch NetworkManager password bug could cost you many, many hours and nerves.
So have a look at https://github.com/ubports/ubuntu-touch/issues/46 (mentioned in another post, if you're searching for 'VPN' here, as well).
Read the first 4 lines of the first post – from member NeoTheThird – and the last 9.
Do the job as described there, perhaps you need to study https://ubports.com/de_DE/blog/ubports-blog-1/post/terminal-chapter-1-113 as well:
"To login as superuser, type: $ sudo - i and your password
To COPY or PASTE: hold your finger on the screen until the contextual menu appears
To SCROLL the window UP or DOWN: use two fingers and swipe
To select a layout, press and hold the square icon on the bottom left side. You'll see the options. Slide the finger to the desired one. [Nano]
Gnu Nano: shortcuts keys for, in this order, help, save, read, previous page, cut text, position, exit, indentation, search, next page, paste text, spellcheck:
CTRL+G, CTRL+O, CTRL+R, CTRL+Y, CTRL+K, CTRL+C, CTRL+X, CTRL+J, CTRL+W, CTRL+V, CTRL+U, CTRL+T"