If your Ubuntu installation sometimes drops into a black screen showing something like /dev/sda1: clean, 227147/30269440 files, 3330843/121068288 blocks, try to get get back to your installation by pressing Alt+F2.
Pyrenamer doesn't exist for Ubuntu 18.04, but GPRename is a similar GUI batch renamer app from the default Ubuntu repositories. To quickly open a program in Ubuntu, you can press the Super (Windows) key and start typing, but GPRename isn't added after installing it:
Setting files for Sublimetext are in this folder in Ubuntu: ~/.config/sublime-text-3/Packages/User
Insert this in ~/.config/sublime-text-3/Packages/User/Preferences.sublime-settings to change the skin, font size, tab size, convert tabs to spaces, etc. You might have to install the Solarized Color Scheme as a Package first: