Is there a way to disable the double tab key behaviour (pressing tab twice shows available commands in Bash)?
Bash uses readline for completion and key bindings. You can set your own options in ~/.inputrc, and system wide options in /etc/inputrc. If these do not exist, you can create them yourself. These are read at shell login, so changes you make are not in effect until you create a new login shell.
If you want to disable completion entirely, you can use a typical GNU "yes to no":
set disable-completion on
If you want completion, but just not with tab, you can bind tab to insert itself:
This will allow you to still use completion with ESC ESC, or you can bind completion to another key of your liking, e.g. C-t:
TAB: self-insert C-t: complete
You can disable autocompletion completely. Some information:
I depends on what exactly do you want to do.
If you just want to disable advanced autocompletion you can either use "complete -r" or remove /etc/bash_completion*
Reading the man page for "complete" might help here. It's a shell thing, it really doesn't have anything to do with a particular distro or another.