How fix hostapd invalid/unknown driver 'nl80211' error?

• I have Intel Centrino Wireless-N 1000
• I installed hostapd from Ubuntu Software Center

• When I run this command hostapd hostapd-minimal.conf I get this:

  root@tarek-PC:~# hostapd hostapd-minimal.conf
  Configuration file: hostapd-minimal.conf
  Line 2: invalid/unknown driver 'nl80211 '
  Line 4: unknown hw_mode 'g '
  2 errors found in configuration file 'hostapd-minimal.conf'
  

After doing make first I had this error:

driver_nl80211.c:25:26: warning: netlink/attr.h: No such file or directory

I solved it by installing libnl-1.0pre8

Now I have this error when doing make command:

../src/crypto/crypto_openssl.c:10:30: fatal error: openssl/opensslv.h: No such file or directory
compilation terminated.
make: *** [../src/crypto/crypto_openssl.o] Error 1

Can anyone help me with that error I am running Ubuntu 13.04?

You need to build, or obtain, a different copy of hostapd. The one you have has been built with the option CONFIG_DRIVER_NL80211 set to N, rather than Y.

There are simple and detailed instructions how to rebuild it here → Hostapd building instruction. Rebuild it with the option enabled. You may have to google for hostapd.2.0.tar.gz, but do exactly as it mentioned in link.

As for the follow-up question/error try to install this library libssl-dev using this command:

sudo apt-get install libssl-dev

You see the spaces after the values? Remove them.

• Line 2: invalid/unknown driver 'nl80211 '

• Line 4: unknown hw_mode 'g '

Check for EOL format. It should be in UNIX format as < LF > and not < CR >< LF >. That fixed mine error.

I had a similar Problem, but without the spaces after the values and managed to solve it:

Before I encountered the Problem, I copied the hostapd.conf file from my Windows pc onto my Raspberry Pi. And I believe the problem was, that the text had special characters. Maybe some returns were different (Because I had a return instead of a space after the values in the errors)

But enough speculation, let's come to my solution:

1. I renamed the old hostapd.conf file (to hostapdOld.conf)
2. I created a new file with the name hostapd.conf
3. And then I copied the whole content of the old file to the new one. (I just selected the whole text, didn't use Ctrl+A, if this even matters)

Then I ran hostapd as usual, with:

sudo hostapd -d /etc/hostapd/hostapd.conf

And it worked again