I'm using Dropbox on an Arch Linux System. Everything worked fine for months now, until today. When running Dropbox from command line, it prints the error message:
Unable to monitor entire Dropbox folder hierarchy. Please run "echo fs.inotify.max_user_watches=100000 | sudo tee -a /etc/sysctl.conf; sudo sysctl -p" and restart Dropbox to fix the problem.
I don't like running terminal commands blindly without thinking about it, especially when running as sudo. So I'd really like to understand why Dropbox needs that fix, especially after running fine for months.
Best Answer
I had this exact issue on Fedora 30. I tried the suggested command but it didn't work. Saw this answer and tried increasing inotify to 500000 instead of 100000 suggested. This worked for me.