Hi Stefan,
I treid another way:
First downloaded only the package from your source.
> 2025-04-15 13:52:39 URL:https://linux.brostrend.com/rtl8821cu-dkms.deb
> [4035666/4035666] -> "rtl8821cu-dkms.deb" [1]
Then just installed it using
dpkg -i rtl8821cu-dkms.deb
This built automatically the kernel module and installed it:
--- snip ----
LANG=C dpkg -i /home/ullhan63/Downloads/rtl8821cu-dkms.deb
(Reading database ... 574778 files and directories currently installed.)
Preparing to unpack .../Downloads/rtl8821cu-dkms.deb ...
Module rtl8821cu-5.12.0 for kernel 6.1.0-33-amd64 (x86_64).
Before uninstall, this module version was ACTIVE on this kernel.
8821cu.ko:
- Uninstallation
- Deleting from: /lib/modules/6.1.0-33-amd64/updates/dkms/
- Original module
- No original module was found for this module on this kernel.
- Use the dkms install command to reinstall any previous module version.
depmod...
Deleting module rtl8821cu-5.12.0 completely from the DKMS tree.
Unpacking rtl8821cu-dkms (5.12.0-16b11) over (5.12.0-16b11) ...
Setting up rtl8821cu-dkms (5.12.0-16b11) ...
Loading new rtl8821cu-5.12.0 DKMS files...
Building for 6.1.0-33-amd64
Building initial module for 6.1.0-33-amd64
Done.
8821cu.ko:
Running module version sanity check.
- Original module
- No original module exists within this kernel
- Installation
- Installing to /lib/modules/6.1.0-33-amd64/updates/dkms/
depmod...
---snap ---
However, make sure, all dependencies for building are installed. The easiest way for this is, to install the package "module-assistant".
Then start it with the commad "m-a". This will start a ncurses gui, and then just perform the steps "update" and "prepare". If something is missing, it will install it.
Hint: When you need to show the output of a commandline, and you do not want it in your own language (here German, as you have a German environment), then just put a "LANG=C" before it,
for example for
apt-get update
use
LANG=C apt-get update
instead. Doing so, your output will be in English. Also helpfull, when you need any other language.
Hope this helps, good luck!
Best
Hans