Fail build driver on Raspi4 Ubuntu 25.10

[Hufnagels]

Hi @morrownr
I want make a travel AP from one RPI4 with the built wifi + Archer T2U PLUS. Kerlen headers are ok, system is updated, BUT the build fail.

Please, help to solve thi issue:

System:
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 25.10
Release: 25.10
Codename: questing

Kernel
name -a
Linux raspiap 6.17.0-1006-raspi #6-Ubuntu SMP PREEMPT_DYNAMIC Fri Nov 21 04:47:39 UTC 2025 aarch64 GNU/Linux

USB WIFI:
lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub

Bus 001 Device 003: ID 2357:0120 TP-Link Archer T2U PLUS [RTL8821AU]

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 004: ID 174c:0825 ASMedia Technology Inc. X825
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

./install-driver.sh
: ---------------------------
: install-driver.sh v20241003
: aarch64 (kernel architecture)
: arm64 (architecture to send to gcc)
: 4/4 (in-use/total processing units)
: 1880148 (total system memory)
: 6.17.0-1006-raspi (kernel version)
: gcc (version of gcc used to compile the kernel)
: gcc (Ubuntu 15.2.0-4ubuntu4) 15.2.0
: dkms-3.2.0
: This system doesn't support Secure Boot
: ---------------------------

Checking for previously installed drivers...
Finished checking for and uninstalling previously installed drivers.
: ---------------------------

Starting installation.
Copying 8821au.conf to /etc/modprobe.d
The dkms installation routines are in use.
Copying source files to /usr/src/rtl8821au-5.12.5.2
Creating symlink /var/lib/dkms/rtl8821au/5.12.5.2/source -> /usr/src/rtl8821au-5.12.5.2
The driver was added to dkms successfully.
: ---------------------------

Sign command: /usr/bin/kmodsign
Binary update-secureboot-policy not found, modules won't be signed

Building module(s)....(bad exit status: 2)
Failed command:
kernelver=6.17.0-1006-raspi ./dkms-make.sh
ERROR (dkms apport): binary package for rtl8821au: 5.12.5.2 not found

Error! Bad return status for module build on kernel: 6.17.0-1006-raspi (aarch64)
Consult /var/lib/dkms/rtl8821au/5.12.5.2/build/make.log for more information.
Command exited with non-zero status 10
Compile time: 3.17 seconds
An error occurred. dkms build error: 10
Please report this error.
Please copy all screen output and paste it into the problem report.
Run the following before reattempting installation.

Thanks

[Hufnagels]

tail -f /var/lib/dkms/rtl8821au/5.12.5.2/build/make.log

make[3]: *** [/usr/src/linux-headers-6.17.0-1006-raspi/Makefile:2016: .] Error 2
make[2]: *** [/usr/src/linux-headers-6.17.0-1006-raspi/Makefile:248: __sub-make] Error 2
make[2]: Leaving directory '/var/lib/dkms/rtl8821au/5.12.5.2/build'
make[1]: *** [Makefile:248: __sub-make] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-6.17.0-1006-raspi'
make: *** [Makefile:2505: modules] Error 2

exit code: 2

elapsed time: 23:00:03

---

[morrownr]

Hi @Hufnagels

Okay, let me see. This is the 25.10 version of Ubuntu for RasPi. It uses kernel 6.17.

How about we try this first:

Go to the driver directory.

Run: sudo sh remove-driver.sh

Reboot

Run and paste the results of: sudo iw dev

[Hufnagels]

Hi @morrownr
Thks for a fast reply 👍
Try.....

[Hufnagels]

The result:
--> wlx98482753d647 this is it....

phy#1

• Interface wlx98482753d647
  ifindex 4
  wdev 0x100000001
  addr 98:48:27:53:d6:47
  type managed
  txpower 0.00 dBm
  multicast TXQ:
  qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-bytes tx-packets
  0 0 0 0 0 0 0 0 0

phy#0

• Unnamed/non-netdev interface
  wdev 0x2
  addr de:a6:32:b4:23:a2
  type P2P-device
  txpower 31.00 dBm
• Interface wlan0
  ifindex 3
  wdev 0x1
  addr dc:a6:32:b4:23:a2
  ssid Telekom-YkuusL
  type managed
  channel 36 (5180 MHz), width: 80 MHz, center1: 5210 MHz
  txpower 31.00 dBm

Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: ++++++++++++++++++++++++++++++++Net device info++++++++++++++++++++++++++++++++
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: +-----------------+-------+-----------+-----------+-------+-------------------+
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: | Device | Up | Address | Mask | Scope | Hw-Address |
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: +-----------------+-------+-----------+-----------+-------+-------------------+
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: | eth0 | False | . | . | . | dc:a6:32:b4:23:a1 |
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: | lo | True | 127.0.0.1 | 255.0.0.0 | host | . |
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: | lo | True | ::1/128 | . | host | . |
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: | wlan0 | False | . | . | . | dc:a6:32:b4:23:a2 |
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: | wlx98482753d647 | False | . | . | . | 98:48:27:53:d6:47 |
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: +-----------------+-------+-----------+-----------+-------+-------------------+
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: +++++++++++++++++++Route IPv6 info+++++++++++++++++++
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: +-------+-------------+---------+-----------+-------+
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: | Route | Destination | Gateway | Interface | Flags |
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: +-------+-------------+---------+-----------+-------+
Oct 07 11:51:54 raspiap cloud-init[865]: ci-info: +-------+-------------+---------+-----------+-------+

[morrownr]

Interface wlan0

That is the interface for your RasPi internal wifi

Interface wlx98482753d647

That is the interface for your Archer T2U PLUS

You didn't know that the Linux kernel has a good in-kernel, standards compliant driver these days. It has been in the kernel since 6.14.

Do you need help setting the PI up as an AP?

[Hufnagels]

@morrownr I appreciate, if You the can help with me some advices

[morrownr]

if You the can help with me some advices

Sure. Ask your questions.