@paci87 This way is great! Thank you very much!

@TotalSonic Thanks for your reply! Does it mean that I must use Libertine if I want to install and use CLI programs?
I'm new to Ubuntu Touch, however I have been using Ubuntu for several years. I would feel more comfortable if I can use CLI programs like what I do on Ubuntu.

I have successfully installed Ubuntu Touch on my Oneplus 3. Thanks for the great work!

However I can't use sudo apt update in terminal. Error messages seem to say that, the repository does not have a release file, and the file system is read-only (although I use sudo). And I wanted to make a copy of the /etc/apt/source.list file with sudo cp source.list source.list.old, but I still got an error said that the file system is read-only.

I noticed that the user displayed on the terminal is "phablet", and I used my 4-digit passcode when sudo asked me for password. I don't know if there's a problem.

Could anyone please give me some suggestions? Any help will be appreciated!