Intel 9260 very slow wifi speeds in Ubuntu 17.10, normal in Windows 10.

[troywolf]

I got desperate, so I took a chance. I have 16 logical CPUs, and this patch seemed to be relevant:
https://git.kernel.org/pub/scm/linux...3f0ca9ef9ad6d8

I downloaded it, unpacked the archive, moved into the directory, then did this as root to build and install:

make defconfig-iwlwifi-public
make -j4
make install

The install did throw several errors around "SSL" related things. Here is the start of them:

Makefile:976: "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel"
  Building modules, stage 2.
  MODPOST 6 modules
Makefile:976: "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel"
  INSTALL /home/twolf/Downloads/backport-iwlwifi-998ce0330c94eca4b13b8f062b3f0ca9ef9ad6d8/compat/compat.ko
At main.c:160:
- SSL error:02001002:system library:fopen:No such file or directory: ../crypto/bio/bss_file.c:74
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: ../crypto/bio/bss_file.c:81

When I rebooted, my system did not even show a WiFi device. modprobe indicated an error due to a key.... Google search suggested I disable secure boot. I did, and now my WiFi works and I have fast downloads and uploads.

[mikehardy]

I'm posting this in a few threads because it may be pertinent, the TL;DR is that an upgrade to the kernel, using the UKUU package, choosing kernel 4.17.14 which is the most current at the moment, fixed it for me and was otherwise painless.

https://unix.stackexchange.com/a/462175/304207