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
