“Too many open files” on Obsidian start-up

If you use the note-taking program Obsidian on Ubuntu, and a recent update has caused it to bomb out when invoked with an error message including the phrase:

Too many open files

then you might be able to fix it trivially by becoming root:

sudo -i

and then typing the following command:

echo 1024 > /proc/sys/fs/inotify/max_user_instances

before typing:

exit

to exit from root privileges.