Latest Ubuntu requires editing sysctl.d (#8974)

Starting with Ubuntu 24.10 the proper place to put max_user_watches is in /etc/sysctl.d/ instead of /etc/sysctl.conf. The method used on Arch Linux applies here too.

Note that the steps provided in the current instructions will work, however on rebooting Ubuntu the default value will be restoed.

Author: jonahgraham

docs/setup/linux.md

@@ -279,7 +279,7 @@ The current limit can be viewed by running:
 cat /proc/sys/fs/inotify/max_user_watches
 ```
 
-The limit can be increased to its maximum by editing `/etc/sysctl.conf` (except on Arch Linux, read below) and adding this line to the end of the file:
+The limit can be increased to its maximum by editing `/etc/sysctl.conf` (except on Arch Linux and Ubutun 24.10 and later, read below) and adding this line to the end of the file:
 
 ```bash
 fs.inotify.max_user_watches=524288
@@ -289,7 +289,7 @@ The new value can then be loaded in by running `sudo sysctl -p`.
 
 While 524,288 is the maximum number of files that can be watched, if you're in an environment that is particularly memory-constrained, you might want to lower the number. Each file watch [takes up 1,080 bytes](https://stackoverflow.com/a/7091897/1156119), so assuming that all 524,288 watches are consumed, that results in an upper bound of around 540 MiB.
 
-[Arch](https://www.archlinux.org/)-based distros (including Manjaro) require you to change a different file; follow [these steps](https://gist.github.com/tbjgolden/c53ca37f3bc2fab8c930183310918c8c) instead.
+[Arch](https://www.archlinux.org/)-based distros (including Manjaro) and Ubuntu-based distros starting with 24.10 require you to change a different file; follow [these steps](https://gist.github.com/tbjgolden/c53ca37f3bc2fab8c930183310918c8c) instead.
 
 Another option is to exclude specific workspace directories from the VS Code file watcher with the `setting(files.watcherExclude)` [setting](/docs/configure/settings.md). The default for `setting(files.watcherExclude)` excludes `node_modules` and some folders under `.git`, but you can add other directories that you don't want VS Code to track.