Missing nl80211 in ubuntu

ubuntu-12.04, uses usb network card rtl8192eu, installed linux driver
installed hostapd, and configured hostapd.conf
wifi to connect normally in sta mode.
but use hostapd to do wifi hotspots, and convert them to AP, prompts that nl80211 is missing

how to solve this?

Embedded linux-kernel wifi ubuntu12.04
Mar.01,2021

Oh, actually, just execute insmod mac80211 or modprobe mac80211

Previous: Delay of two-way data binding in vue input

Next: Undefined reference to `le32toh'

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e458d8-590c9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e458d8-590c9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?