Niklas's questions

I have (at least) one problem with my wifi on my Lenovo E480 Notebook running Ubuntu 16.04 with a Realtek b822 wireless card. I can't really pin down what the real problem is.

I observed the listed problems below. Sometimes together, sometimes alone. After reconnecting to the network they are sometimes solved, sometimes not:

• Most of the time really slow connection (0.1 Mbit/s compared to 100 Mbit/s with Ethernet)
• Using ping 8.8.8.8 I found out that I get a lot of packet loss. Sometimes it says 'Destination host unreachable' but I am still connected to the wifi.
• It's really unpredictable. It may work good for hours and suddenly decide to stop working. Or it works 5min before I need to reconnect again and again.

I'm mainly using my home network (WPA2) and the 'eduroam' network at university. The "Destination host unreachable"-problem seems to occur more in the university network. The wifi connection at home is always slow. (Just for the notebook, not for other devices.)

sudo lspci -v

05:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device b822
Subsystem: Lenovo Device b023
Flags: bus master, fast devsel, latency 0, IRQ 139
I/O ports at b000 [size=256]
Memory at f2100000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [148] Device Serial Number 00-e0-4c-ff-fe-b8-22-01
Capabilities: [158] Latency Tolerance Reporting
Capabilities: [160] L1 PM Substates
Kernel driver in use: r8822be
Kernel modules: r8822be

The 'unassigned class' line seems suspicious..

sudo lshw

*-generic
            description: Wireless interface
            product: Realtek Semiconductor Co., Ltd.
            vendor: Realtek Semiconductor Co., Ltd.
            physical id: 0
            bus info: pci@0000:05:00.0
            logical name: wlp5s0
            version: 00
            serial: e8:2a:44:ff:bf:f9
            width: 64 bits
            clock: 33MHz
            capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
            configuration: broadcast=yes driver=r8822be driverversion=4.15.0-43-generic firmware=N/A ip=192.168.0.74 latency=0 link=yes multicast=yes wireless=IEEE 802.11
            resources: irq:139 ioport:b000(size=256) memory:f2100000-f210ffff

If you need more system information, please let me know. Thanks a lot!

While using htop for some other stuff I noticed a programm called 'avahi-daemon' which is using quiet a lot of my maximum CPU load and definitely more than all other programs. I read it is some kind of programm for easy file sharing in local networks, so my question is if I can just disable it, when not needed or is it necessary for something I'm not aware of? It is working without error, but I want to save some battery..

Thanks!

Edit: I'm aware that 15% constant usage is not a lot, but is much more than other programs use most of the times. That's why the question is if this program which I'm not using needs to be running

I'm trying to install the mitmproxy package via pip like this:

$ sudo pip install mitmproxy

It terminates with following error message:

x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c build/temp.linux-x86_64-2.7/_openssl.c -o build/temp.linux-x86_64-2.7/build/temp.linux-x86_64-2.7/_openssl.o

build/temp.linux-x86_64-2.7/_openssl.c:391:30: fatal error: openssl/opensslv.h: No such file or directory

compilation terminated.

error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

----------------------------------------
  Can't roll back cryptography; was not uninstalled
Cleaning up...
Command /usr/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip-build-jvLTVf/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-DrY4DI-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /tmp/pip-build-jvLTVf/cryptography
Storing debug log for failure in /home/niklas/.pip/pip.log

After this it's somewhat installed, at least I can uninstall it afterwards.

 $ mitmproxy

leads to

Traceback (most recent call last):
  File "/usr/local/bin/mitmproxy", line 7, in <module>
    from mitmproxy.main import mitmproxy
  File "/usr/local/lib/python2.7/dist-packages/mitmproxy/main.py", line 7, in <module>
    from . import version, cmdline
  File "/usr/local/lib/python2.7/dist-packages/mitmproxy/cmdline.py", line 6, in <module>
    import configargparse
ImportError: No module named configargparse