Can anybody recommend a (text-based, no database) checklist application for Ubuntu?

[freemedia2018]

Either GUI (using flat textfiles) or command line (using flat textfiles.)

"Either" version of Ubuntu as well-- LTS or the latest release.

[PhilGil]

todo.txt if you want a simple to-do application (http://todotxt.org/). Todo.txt itself is just a formatted text file, but there are multiple GUI applications that use it as a back end.

If you'd like something that's more of a note taking application that has check box functionality, I like Zim and QOwnNotes. Both use text files as their data store.

I'm sure there are others, but these are ones I've used and can recommend.

[dragonfly41]

Cherrytree editor .. in Software Centre .. is my favourite note manager.

Write hierarchical notes, use tags to link themes.

[freemedia2018]

Thanks everybody, http://todotxt.org/ would probably work here. I've tried Cherrytree and it's pretty cool for notes, I didn't notice any specific checklist features. Please feel free to mention others.