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Omar Hossam Ahmed
Asked: 2017-11-23 14:03:13 +0800 CST

Usb Wifi adapter stopped working after forceful shutdown

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I have a tl-wn722n. I installed the driver 8188eu using dkms and then ran it with modprobe the first time after installing ubuntu 16.04 and it was working. Now after a forceful shut down (through the power button), the wifi isn't working. I tried to run sudo modprobe 8188eu but I am getting modprobe:ERROR: could not insert '8188eu8': Exec format error. How can I fix this? Thank you

drivers

2 Answers

  1. I solved it by uninstalling 8188eu driver by dkms and removing it from the kernel source tree , then adding it and installing it again. Probabbly it got corrupted due to the forceful shutdown.

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  2. If you used https://github.com/lwfinger/rtl8188eu to make the driver you need to edit the dkms.conf file or you will have issues after every kernel update. 

    sudo -H gedit /usr/src/8188eu-1.0/dkms.conf
    Make it look like 
    PACKAGE_NAME="8188eu"
PACKAGE_VERSION="1.0"
BUILT_MODULE_NAME="8188eu"
DEST_MODULE_LOCATION="/kernel/drivers/net/wireless/"
REMAKE_INITRD="yes"
AUTOINSTALL="yes"
MAKE="'make' all KVER=${kernelver}"
CLEAN="'make' clean"
    Save and exit. The original dkms.conf has another MAKE line after MAKE="'make' all KVER=${kernelver}" that messes up the kernel versioning and that is why you got the "Exec Format Error"

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