Hi
I'm not sure if this issue is specific to Linux Mint or generic for all Linux.
I've just got a mini pc (Intel NUC 8i7BEH kit) to replace my agring windows 7 laptop. I decided to try to break away from Microsoft and try Linux instead. However I have no Linux experience whatsoever and am not very technical.
I have installed Mint 19 cinnamon, but the wifi connection is very slow (<2Mb/s vs 64Mb on the windows 7 machine, using the same router and speedchecker). Router is Virgin Media Hub 3.0.
I have read about similar problems on several forums & have tried to follow some of the advice (without necessarily understanding whast I was doing!) I have:
1. Upgraded mint to 19.1Tessa - Kernel 4.15.0.20 64 bit - Base is Ubuntu 18.04 bionic
2. Disabled power management for wireless chipset
3. Ran SUDO APT-GET-UPGRADE (think this upgrades packages? what are packages?)
4. Run driver Manager (says "No proprietary drivers are in use")
None of the above made any difference.

Integrated wireless is Intel Wireless-AC 9650 + Bluetooth 5.0
System Information re. Network is:
Device-1: Intel driver: iwlwifi v: kernel port: 4000 bus ID: 00:14.3 chip ID: 8086:9df0
IF: wlp0s20f3 state: up mac: <filter>
Device-2: Intel Ethernet I219-V driver: e1000e v: 3.2.6-k port: efa0 bus ID: 00:1f.6
chip ID: 8086:15be
IF: eno1 state: down mac: <filter>

Don't know if this is relevant, but I originally downloaded Linux Mint 19, but couldn't get anywhere with validating the
checksum thingy, so I bought a USB version, but this wasn't recognised as bootable until I changed from UEFI to
BIOS. Now that Mint is installed it will only boot in Bios.

If anyone has similar problems with this Intel wifi or has any ideas I'd greatly appreciate your help.

The hardware is recent and should do 802.11n, the fastest wifi protocol. Are the drivers handling it correctly? Is the network setup ok?

In Mint open a terminal, max it onscreen, and try You should get the last 100 lines of logging. Check them for network related stuff, and errors 'not found' 'can't find' etc.

Hi business kid
Many thanks for your reply
The output from dmesg is:
sudo dmesg | tail -n 100
[96337.144093] logitech-hidpp-device 0003:046D:404D.000A: HID++ 4.1 device connected.
[111880.894196] perf: interrupt took too long (3963 > 3927), lowering kernel.perf_event_max_sample_rate to 50250
[117743.821261] wlp0s20f3: deauthenticating from 40:0d:10:b9:8c:67 by local choice (Reason: 3=DEAUTH_LEAVING)
[117743.829586] wlp0s20f3: failed to remove key (1, ff:ff:ff:ff:ff:ff) from hardware (-22)
[117743.829645] wlp0s20f3: failed to remove key (2, ff:ff:ff:ff:ff:ff) from hardware (-22)
[117743.877592] PM: suspend entry (deep)
[117743.877593] PM: Syncing filesystems ... done.
[117743.880007] Freezing user space processes ... (elapsed 0.012 seconds) done.
[117743.892119] OOM killer disabled.
[117743.892120] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
[117743.893244] Suspending console(s) (use no_console_suspend to debug)
[117743.894526] e1000e: EEE TX LPI TIMER: 00000011
[117743.912015] tpm tpm0: A TPM error (325) occurred stopping the TPM
[117743.936358] sd 2:0:0:0: [sda] Synchronizing SCSI cache
[117743.936697] sd 2:0:0:0: [sda] Stopping disk
[117744.445249] ACPI: Preparing to enter system sleep state S3
[117744.449214] ACPI: EC: event blocked
[117744.449215] ACPI: EC: EC stopped
[117744.449216] PM: Saving platform NVS memory
[117744.449310] Disabling non-boot CPUs ...
[117744.465043] IRQ 140: no longer affine to CPU1
[117744.466095] smpboot: CPU 1 is now offline
[117744.489021] IRQ 149: no longer affine to CPU2
[117744.490060] smpboot: CPU 2 is now offline
[117744.512987] IRQ 144: no longer affine to CPU3
[117744.512999] IRQ 148: no longer affine to CPU3
[117744.515309] smpboot: CPU 3 is now offline
[117744.536893] IRQ 128: no longer affine to CPU4
[117744.536906] IRQ 143: no longer affine to CPU4
[117744.537948] smpboot: CPU 4 is now offline
[117744.560798] IRQ 122: no longer affine to CPU5
[117744.560809] IRQ 125: no longer affine to CPU5
[117744.560831] IRQ 145: no longer affine to CPU5
[117744.560837] IRQ 146: no longer affine to CPU5
[117744.561870] smpboot: CPU 5 is now offline
[117744.585823] smpboot: CPU 6 is now offline
[117744.609866] smpboot: CPU 7 is now offline
[117744.614892] ACPI: Low-level resume complete
[117744.615011] ACPI: EC: EC started
[117744.615011] PM: Restoring platform NVS memory
[117744.616039] Enabling non-boot CPUs ...
[117744.616077] x86: Booting SMP configuration:
[117744.616078] smpboot: Booting Node 0 Processor 1 APIC 0x2
[117744.616674] cache: parent cpu1 should not be sleeping
[117744.616851] CPU1 is up
[117744.616881] smpboot: Booting Node 0 Processor 2 APIC 0x4
[117744.617474] cache: parent cpu2 should not be sleeping
[117744.617638] CPU2 is up
[117744.617662] smpboot: Booting Node 0 Processor 3 APIC 0x6
[117744.618237] cache: parent cpu3 should not be sleeping
[117744.618408] CPU3 is up
[117744.618429] smpboot: Booting Node 0 Processor 4 APIC 0x1
[117744.619115] cache: parent cpu4 should not be sleeping
[117744.619305] CPU4 is up
[117744.619342] smpboot: Booting Node 0 Processor 5 APIC 0x3
[117744.619918] cache: parent cpu5 should not be sleeping
[117744.620113] CPU5 is up
[117744.620146] smpboot: Booting Node 0 Processor 6 APIC 0x5
[117744.620732] cache: parent cpu6 should not be sleeping
[117744.620933] CPU6 is up
[117744.620964] smpboot: Booting Node 0 Processor 7 APIC 0x7
[117744.621555] cache: parent cpu7 should not be sleeping
[117744.621787] CPU7 is up
[117744.629681] ACPI: Waking up from system sleep state S3
[117744.677608] dpc 0000:00:1d.6cie010: DPC containment event, status:0x1f00 source:0x0000
[117744.677616] pciehp 0000:00:1d.6cie004: Slot(18): Link Up
[117744.741971] ACPI: EC: event unblocked
[117744.743609] sd 2:0:0:0: [sda] Starting disk
[117744.849825] nvme nvme0: Shutdown timeout set to 10 seconds
[117744.894018] rtc_cmos 00:02: Alarms can be up to one month in the future
[117745.474845] acpi LNXPOWER:04: Turning OFF
[117745.474901] OOM killer enabled.
[117745.474902] Restarting tasks ...
[117745.478489] [drm] RC6 on
[117745.481505] done.
[117745.545574] thermal thermal_zone4: failed to read out thermal zone (-61)
[117745.545579] video LNXVIDEO:00: Restoring backlight state
[117745.545580] PM: suspend exit
[117746.977615] ata3: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[117746.990402] ata3.00: ACPI cmd ef/10:06:00:00:00:00 (SET FEATURES) succeeded
[117746.990413] ata3.00: ACPI cmd f5/00:00:00:00:00:00 (SECURITY FREEZE LOCK) filtered out
[117746.990420] ata3.00: ACPI cmd b1/c1:00:00:00:00:00 (DEVICE CONFIGURATION OVERLAY) filtered out
[117747.052579] ata3.00: ACPI cmd ef/10:06:00:00:00:00 (SET FEATURES) succeeded
[117747.052588] ata3.00: ACPI cmd f5/00:00:00:00:00:00 (SECURITY FREEZE LOCK) filtered out
[117747.052594] ata3.00: ACPI cmd b1/c1:00:00:00:00:00 (DEVICE CONFIGURATION OVERLAY) filtered out
[117747.089791] ata3.00: configured for UDMA/133
[117747.204842] e1000e: eno1 NIC Link is Down
[117747.205280] IPv6: ADDRCONF(NETDEV_UP): eno1: link is not ready
[117747.393626] IPv6: ADDRCONF(NETDEV_UP): eno1: link is not ready
[117747.394456] IPv6: ADDRCONF(NETDEV_UP): wlp0s20f3: link is not ready
[117747.597417] IPv6: ADDRCONF(NETDEV_UP): wlp0s20f3: link is not ready
[117747.640342] IPv6: ADDRCONF(NETDEV_UP): wlp0s20f3: link is not ready
[117751.048679] wlp0s20f3: authenticate with 40:0d:10:b9:8c:67
[117751.054565] wlp0s20f3: send auth to 40:0d:10:b9:8c:67 (try 1/3)
[117751.093601] wlp0s20f3: authenticated
[117751.097442] wlp0s20f3: associate with 40:0d:10:b9:8c:67 (try 1/3)
[117751.099732] wlp0s20f3: RX AssocResp from 40:0d:10:b9:8c:67 (capab=0x511 status=0 aid=3)
[117751.101974] wlp0s20f3: associated
[117751.127804] IPv6: ADDRCONF(NETDEV_CHANGE): wlp0s20f3: link becomes ready
[117751.189656] wlp0s20f3: Limiting TX power to 23 (23 - 0) dBm as advertised by 40:0d:10:b9:8c:67

I don''t see any 'not found' etc.
You mention drivers and Intel provide one here:
https://www.intel.co.uk/content/www/...etworking.html
(the top one - Intel® Wireless-AC 9560) I downloaded this and went into Driver Manager but it doesn't seem to offer any options to install - when i open it it just runs something ('updating cache') then says 'No propreitary drivers are in use. there are mo menu options or anything.
I don't know if the network is set up ok but I do have internet access - just very slow.
(It's possible that Linux will be too technical for me and maybe I'd be better to just go with Windows)

I find myself wondering why it's called wlp0s20f3, and not wlp0s20f0, 1, or 2.
Run 'sudo iwconfig' with no options to find out. There's usually only one wifi thing.

I really don't know. No obvious mistake is there. I'd post on your distro forums if you don't get an answer here.

Hi
sudo iwconfig returns:

m@m-NUC8i7BEH:~$ sudo iwconfig
[sudo] password for m:
lo no wireless extensions.

eno1 no wireless extensions.

wlp0s20f3 IEEE 802.11 ESSID:"VM9500452"
Mode:Managed Frequency:5.22 GHz Access Point: 40:0D:10:B9:8C:67
Bit Rate=400 Mb/s Tx-Power=22 dBm
Retry short limit:7 RTS thrff Fragment thrff
Encryption keyff
Power Managementff
Link Quality=63/70 Signal level=-47 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0

Does any of this look significant?

I ran sudo lshw which gives hardware information and I notice that the firmware numbers are different. Could this indicate wrong drivers? If so, is it possible to install the Intel version in Linux?

--Extract from sudo lshw:
*-network:0
description: Wireless interface
product: Intel Corporation
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
logical name: wlp0s20f3
version: 30
serial: 00:bb:60:47:09:9b
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi
driverversion=4.15.0-20-generic
firmware=34.3125811985.0
ip=192.168.0.19 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: iomemory:400-3ff irq:16 memory:404ac10000-404ac13fff

--From Intel website:
Device Kernels Firmware
Intel® Wireless-AC 9560 4.14+ iwlwifi-9000-pu-b0-jf-b0-34.618819.0.tgz

Moved: This thread is more suitable in <Linux Mint> and has been moved accordingly to help your thread/question get the exposure it deserves.

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I find myself wondering why the clock is so slow. PCI express is 66MHz minimum PCI is 33MHz absolute minimum,band something with a 33 MHz clock wouldn't go that fast anyhow.
To have WiFi gradually reducing speed, your clock would have to be hundreds of MHz. They went up to pci-4x (=133MHz)? I can't say how fast PCIE is these days.

Hi
Intel spec gives:
PCI Express Revision Gen3
PCI Express Configurations M.2 slot with PCIe X4 lanes
According to wiki PCI Express Revision 3 is 985 MB/s (×1)
Intel say this 'wireless solution' supports Linux; specs are here:
https://www.intel.co.uk/content/www/...s-ac-9560.html
Since it all comes as an Intel package could the speed be wrong? This stuff''s a bit over my head to be honest.

SOLVED - Upgraded kernel to 4.15.0-45 and broadband speed now up to normal