Chisel does not currently support package names shorter than 3 characters. This is controlled by a few regular expressions specified in the setup package.

However, this means that packages like jq are not currently supported. Per the debian policy, the minimum length of a package's name can be 2.

Package names (both source and binary, see Package) must consist only of lower case letters (a-z), digits (0-9), plus (+) and minus (-) signs, and periods (.). They must be at least two characters long and must start with an alphanumeric character.

Related: canonical/chisel-releases#116