> I use Linux daily and don't want to switch to Windows just to connect to the printer's FTP service
I wonder if the author tried using their file manager to connect? I haven't needed any kind of external file management system since switching to Linux, Dolphin just handles everything (sftp, ftp, samba, etc) for me natively in the same window.
My favorite way to connect to FTP servers on Linux was with lftp from the command line. I say was because I don’t really use FTP anymore. I do use Linux still though.
lftp is available in every package manager I know.
Man page: https://linux.die.net/man/1/lftp
Actually lftp supports a lot of different protocols but I only ever used it for FTP, FTPS and SFTP.
Ironically, Microsoft recently (few years ago) removed the FTP client from Explorer.
That was my first thought as well, there is special client needed on all major desktops.
Or use mc (midnight commander).