Tenda U12 on Ubuntu 21.04

**linub2** · July 31st, 2021

Hello
I was using ubuntu 20.04 and after i upgraded to Ubuntu 21.04 my wifi adapter Tenda U12 isn't working, the wireless icon in top right it is not showing up when i plug the adapter. In 20.04 i have installed this adapter with this tutorial https://medium.com/@manuelmauricioza...x-2a5796decb81 , now when i'm trying to run the first command it gives

fatal: destination path 'rtl8812au-5.6.4.2' already exists and is not an empty directory.

then

Code:

cd rtl8812au-5.6.4.2

and

Code:

make

it gaves this

/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c:2203:11: error: implicit declaration of function ‘get_fs’; did you mean ‘get_sa’? [-Werror=implicit-function-declaration] 2203 | oldfs = get_fs();
| ^~~~~~
| get_sa
/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c:2203:11: error: incompatible types when assigning to type ‘mm_segment_t’ from type ‘int’
/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c:2205:3: error: implicit declaration of function ‘set_fs’; did you mean ‘sget_fc’? [-Werror=implicit-function-declaration]
2205 | set_fs(KERNEL_DS);
| ^~~~~~
| sget_fc
/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c:2205:10: error: ‘KERNEL_DS’ undeclared (first use in this function); did you mean ‘KERNFS_NS’?
2205 | set_fs(KERNEL_DS);
| ^~~~~~~~~
| KERNFS_NS
/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c:2205:10: note: each undeclared identifier is reported only once for each function it appears in
/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c: In function ‘retriveFromFile’:
/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c:2245:12: error: incompatible types when assigning to type ‘mm_segment_t’ from type ‘int’
2245 | oldfs = get_fs();
| ^~~~~~
/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c:2247:11: error: ‘KERNEL_DS’ undeclared (first use in this function); did you mean ‘KERNFS_NS’?
2247 | set_fs(KERNEL_DS);
| ^~~~~~~~~
| KERNFS_NS
/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c: In function ‘storeToFile’:
/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c:2284:12: error: incompatible types when assigning to type ‘mm_segment_t’ from type ‘int’
2284 | oldfs = get_fs();
| ^~~~~~
/home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.c:2286:11: error: ‘KERNEL_DS’ undeclared (first use in this function); did you mean ‘KERNFS_NS’?
2286 | set_fs(KERNEL_DS);
| ^~~~~~~~~
| KERNFS_NS
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:287: /home/ld/rtl8812au-5.6.4.2/os_dep/osdep_service.o] Error 1
make[1]: *** [Makefile:1848: /home/ld/rtl8812au-5.6.4.2] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.11.0-22-generic'
make: *** [Makefile:2271: modules] Error 2

I must say that i'm new and i don't know what to do to fix?