To triage is to make a listed bug ready to be fixed by a developer:
🔧 It isn't a support request.
💿 There's no evidence that the software has been installed from a third party or personal archive.
💻 It contains enough information as far as possible.
🎯 The title is specific and meaningful.
🔳 The panel hasn't any obvious error for you.
🐾 There isn't any obvious duplicate.
🕑 As a stable release update if appropriate.
📜 As a papercut if needed.
🔑 As a security bug if needed.
💟 As a kernel bug if needed
💬 As a translation bug if needed.
🔓 Make it public if needed (carefully).
📨 Ask to report upstream if needed.
📤 Set its status to triaged if appropriate.
If at any point there's missing information:
Set the bug status to incomplete.
Ask the bug reporter to provide the information, and to set the bug status back to confirmed when done.
If you need to clarify specific doubts, you can have a look at the detailed triaging guide.
If you want to triage for this project, you can do by joining the Papercuts Ninjas.
If you want to triage for Ubuntu, you can do by joining the Ubuntu Bug Control team.