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

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MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3673a-4d6b2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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