Autocomplete not working with VIM with Pathogen

[Oliver-Chalkley]

I installed the vim-terraform plugin using Pathogen. The syntax highlighting and the indenting worked but the autocompletion did not. So then I went to vim-terraform-completion and used Pathogen to install Syntastic and vim-terraform-completion (used the minimal configuration advised on the github page). However, autocomplete still does not work and strange things happen when I open a file with vim (see screenshot below). Eventually, the actual file does open but VIM will occasionally show similar strange characters when I do things like save the file.

This is done in the Linux development environment of my Chromebook.

Any ideas how to fix this?