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So I was trying to reinstall my drivers rtl873be for HP laptop as I was getting very weak signals, but I guessed I messed it up in between and now my wifi option doesn't appear in the menu. I am working on ubuntu 14.04 LTS. My wlan0 is also missing.
I will post the details of some commands which I found on similar threads.
The module might not be loaded. Or the interface might be down. You could also be missing the firmware for the driver. The $(ifconfig -a) lists the interfaces even those not currently configured. You could also be using newer stuff that renames things to wlp1s0 instead of wlan0, but ifconfig -a should still list it and it's current name. If you move between hardware that interface name could bump up a number too. Like wlan1, wlan2, and such. Removing /etc/udev/rules.d/70-net-persistent.rules and rebooting will let it grab a new default number, likely 0. In case you don't want to redo scripts with firewall rules and other stuff. Maybe even edit the udev rules to give it a custom name (also requires a reboot / simpler than restarts under systemd) like marypoppins0, although I've haven't tried that in a while.
invalid argument? Something is odd for sure. At worse that should have been module not found.
$ egrep -r -i rtl8723 /etc/modprobe.d/*
$ sudo modinfo rtl8723be
Seems like you have "options" being passed to rtl8723be if it's error-ing on invalid instead of missing. My hp stream 11 has this chipset and aside from having to use outside of distro sources and firmware (for stability), it works fine.
Put a # in front of the lines in that file in /etc/modprobe.d/rtl8723be.conf. This will comment it out so it doesn't get used (after a reboot).
Otherwise ubuntu vivid is a bit old. It works out of the box for me on debian 8 / jessie. Caveats, unstable after an hour or more without updating the driver and firmware. Out of the box and flawless on fedora 23 for me. Otherwise the lwfinger github repo for rtlwifi_new and the newest firmware from kernel.org (manually installed).
I don't know if you noticed, but you used modinfo on rtl872323be not rtl8723be.
You should be able to bypass the options thing if you use the insmod on the kernel module file directly.
Seems that your driver didn't pass the verification step. I'm not sure if that's a secure boot thing or if you need to depmod -a and other old school steps. Perhaps reinstalling the kernel would help. By distro means hopefully.
Invalid parameters is odd since you're not technically passing any parameters(i'd suspect missing firmware). The output of dmesg might shed some light about what is actually going on. Or cut your losses and re-install or use a different kernel, that one is obviously not working for you.
Assuming the build doesn't fail. Ubuntu Vivid (15.04) is kind of dated. The wifi firmware that came out July-ish 2015 fixed my stability issues with my rtl8723be. It worked before that, but would lose connection after an hour or two, and progressively shorter amounts of time after that if I didn't reboot.
I am getting the following error:-
sudo apt-get install linux-image-amd64 linux-headers-amd64
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package linux-headers-amd64 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Unable to locate package linux-image-amd64
E: Package 'linux-headers-amd64' has no installation candidate