[NAME]  Short answer: No, you can't do that.  If you want to connect a second display, you'll need to connect it some other way, such as with a USB-C to DisplayPort cable.  If you want to run dual 3440x1440 displays, power, and other peripherals through a single connection, you'd need a docking station, and probably a Thunderbolt docking station.Longer answer: Daisy chaining only works using DisplayPort or Thunderbolt (if your displays support actual Thunderbolt, not just USB-C).  You cannot use HDMI for daisy chaining since it doesn't support running multiple independent displays from a single output.  Although even some multi-purpose hubs that have a DisplayPort output, like Dell's own DA300 adapter, don't support DisplayPort MST on the output as needed for daisy chaining.  And even if you had a DP output that supported daisy chaining on that hub, I don't think you'd have enough bandwidth to run dual 3440x1440 displays through that hub.  First, you're using USB-C rather than Thunderbolt, and USB-C multi-purpose hubs that configure the USB-C link to carry USB 3.x data and video simultaneously have to cut video bandwidth in half to allow USB 3.x due to how USB-C works.  (USB4 will be changing this, but the XPS 13 9300 doesn't support that.)  If your Anker hub specifically supports DisplayPort 1.4 Alt Mode rather than the more common 1.2 Alt Mode, then you'd have enough bandwidth for dual 2560x1440, but not sure about 3440x1440.  But again it's moot here since you only have HDMI.  And this is why I don't think a regular USB-C docking station would work either.  But a Thunderbolt docking station would, because Thunderbolt can tap into much more video bandwidth than regular USB-C, enough to run dual 4K 60 Hz.So you'll need to either 
My hardware:- Laptop: Dell XPS 13 9300 (Developer Edition, Ubuntu OS)- Monitor: Dell UltraSharp 34 Curved Monitor U3415W- Hub: Anker USB C Hub (1 4k HDMI, 100W Power, 1 x USBA, 1xUSB C) My laptop is connected to my monitor through my USB-C hub's HDMI connection, and my mouse / keyboard are plugged into my monitor. I would like to buy a second ultrawide monitor; I would like to connect monitor 1 to monitor 2 using a HDMI cable or some other cable, and run a single HDMI cable into my hub like I'm currently doing. I believe MST Daisychaining is required for this to work; will my laptop support this setup, and will a single HDMI output to a hub work?
Connecting two ultrawides to an XPS 9300