I can talk with my friend and watch images each other in skype,that is to say that built-in microphone and speaker can be used in skype on my Ubuntu OS.

There is no wechat's official version running on Linux,wechat only can run on android,iPhone,mac,windows.
Some geeker use docker to build wechat in Linux this way:

docker pull bestwu/wechat

xhost +

docker run -d --name wechat --device /dev/snd 

           -v /tmp/.X11-unix:/tmp/.X11-unix 

           -v $HOME/WeChatFiles:/WeChatFiles 

           -e DISPLAY=unix$DISPLAY 

           -e XMODIFIERS=@im=fcitx 

           -e QT_IM_MODULE=fcitx 

           -e GTK_IM_MODULE=fcitx 

           -e AUDIO_GID=`getent group audio | cut -d: -f3` 

           -e GID=`id -g` 

Now to input wechat in terminal,i can use it to input text ,i can hear friend's voice ,but he can't hear my voice,no image can be showed on screen(the image can be shown in cheese and skype),
the built-in microphone and camera can't be used in wechat.How can fix it?

The possible way :

electron-wechat

Installed ,can't be start successfully.

wechat on web