Best desktop mini computer to buy for Ubuntu Mate

I have the Zotac ci327 Nano and I can recommend it if you're OK with the specs.

System:    Host: ToyBox Kernel: 4.15.0-38-generic x86_64 bits: 64
           Desktop: MATE 1.20.1  Distro: Ubuntu 18.04.1 LTS
Machine:   Device: desktop Mobo: NA model: ZBOX-CI327NANO-GS-01 serial: N/A
           UEFI: American Megatrends v: 5.12 date: 04/13/2017
CPU:       Quad core Intel Celeron N3450 (-MCP-) cache: 1024 KB
           clock speeds: max: 2200 MHz 1: 1471 MHz 2: 1775 MHz 3: 1960 MHz
           4: 1948 MHz
Memory:    Array-1 capacity: 16 GB devices: 2 EC: None
           Device-1: ChannelA-DIMM0 size: 4 GB speed: 1600 MT/s type: DDR3
           Device-2: ChannelA-DIMM1 size: 4 GB speed: 1600 MT/s type: DDR3
Graphics:  Card: Intel Device 5a85
           Display Server: X.Org 1.19.6
           drivers: modesetting (unloaded: fbdev,vesa)
           Resolution: [email protected], [email protected]
           OpenGL: renderer: Mesa DRI Intel HD Graphics 500 (Broxton 2x6)
           version: 4.5 Mesa 18.0.5
Audio:     Card Intel Celeron N3350/Pentium N4200/Atom E3900 Series Audio Cluster
           driver: snd_hda_intel
           Sound: Advanced Linux Sound Architecture v: k4.15.0-38-generic
Network:   Card-1: Intel Wireless 3165 driver: iwlwifi
           IF: wlp1s0 state: up mac: 70:1c:e7:00:00:00
           Card-2: Realtek RTL8111/8168/8411 PCIE Gigabit Ethernet Controller
           driver: r8169
           IF: enp2s0 state: up speed: 1000 Mbps duplex: full
           mac: 00:01:2e:78:4a:ca
           Card-3: Realtek RTL8111/8168/8411 PCIE Gigabit Ethernet Controller
           driver: r8169
           IF: enp3s0 state: up speed: 1000 Mbps duplex: full
           mac: 00:01:2e:78:4a:cb
Drives:    HDD Total Size: 1120.2GB (78.3% used)
           ID-1: /dev/sda model: LDLC size: 120.0GB
           ID-2: USB /dev/sdd model: Elements_25A2 size: 1000.2GB
Partition: ID-1: / size: 110G used: 95G (91%) fs: ext4 dev: /dev/sda2
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 69.0C mobo: N/A
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 266 Uptime: 22 days Memory: 4350.0/7823.3MB
           Client: Shell (bash) inxi: 2.3.56 

It's not top-of the line hardware, as you can see, however it is a fairly decent desktop and the networking gear does allow you to do interesting things such as this:

There is no driver issue except some tendency of the bluetooth card to lag when running in audio sink mode.

It is a fanless machine so noise is nonexistent if you are running it from a SSD drive.