Linux Mint 21.3 - Cinnamon

You can use rfind or fdupes both installable via apt. See 4 Useful Tools to Find and Delete Duplicate Files in Linux for more details.

Open Files, search (control-f) for a given extension (eg .mp3), and then sort on file name; this will allow to delete duplicates by hand, and at the same time ...

dupeGuru is a tool to find duplicate files on your computer. It can scan either filenames or contents. The filename scan features a fuzzy matching algorithm.

A duplicate is a file that you get a 0 return code from the diff command. The simplest thing to do is to run a double loop over all the files in the directory ...

You can use fdupes. From man fdupes : Searches the given path for duplicate files. Such files are found by comparing file sizes and MD5 signatures.

FSlint and its backend findup probably do exactly what you need: FSlint scans the files and filters out files of different sizes.

FSlint is a tool that helps us to search and remove unnecessary duplicate files, empty directories, temp files, or files with incorrect names completely.

czkawka is a pretty awsome tool written in Rust that can detect duplicat Images and files. It has a basic simple Gui and is pretty fast.

Open up the web UI of the NAS, start Storage Analyzer (install it first from Package Center if you don't have it installed), let it do its thing ...

Learn how to find and delete duplicate files in Linux using rdfind, fdupes, and rmlint command line tools, as well as using GUI tools ...