Hi I’m having the same issues. It appears that the issue is related to GPG as I was unable to start tor browser where gpg hangs with refreshing keys message.
However, I was able to install the Tor browser on Ubuntu 18.04 manually.
I will need to update the above article but for now try this:
First, download the tor package and sig file. Next, Import TOR GPG keys:
$ gpg --auto-key-locate nodefault,wkd --locate-keys firstname.lastname@example.org
Next, verify the downloaded package. Please note that your tor version might be different so update the command with appropriate version:
$ gpg --verify tor-browser-linux64-9.0.2_en-US.tar.xz.asc tor-browser-linux64-9.0.2_en-US.tar.xz
gpg: Signature made Tue 03 Dec 2019 05:50:28 AEDT
gpg: using RSA key EB774491D9FF06E2
gpg: Good signature from "Tor Browser Developers (signing key) <email@example.com>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: EF6E 286D DA85 EA2A 4BA7 DE68 4E2C 6E87 9329 8290
Subkey fingerprint: 1107 75B5 D101 FB36 BC6C 911B EB77 4491 D9FF 06E2
linuxconfig@linuxconfig-org:~$ tar xJpf tor-browser-linux64-9.0.2_en-US.tar.xz
Extract the tarball:
$ tar xJpf tor-browser-linux64-9.0.2_en-US.tar.xz
and simply run the Tor browser from terminal. I recommend to start Tor from the terminal at least for a first time so you might be able to see possible error messages etc. ( if any ):
$ cd tor-browser_en-US/
Hope this helps…