How to change Locale on Ubuntu 20.04 x64?

Answer 1, Authority 100%

First step – check the current language settings of the system. To do this, execute the Locale command without arguments:

lang = en_us.utf-8
Language =.
LC_CTYPE = "EN_US.UTF-8"
LC_NUMERIC = RU_RU.UTF-8
LC_TIME = RU_RU.UTF-8
LC_COLLATE = "EN_US.UTF-8"
LC_MONETARY = RU_RU.UTF-8
LC_MESSAGES = "EN_US.UTF-8"
LC_PAPER = RU_RU.UTF-8
LC_NAME = RU_RU.UTF-8
LC_ADDRESS = RU_RU.UTF-8
LC_TELEPHONE = RU_RU.UTF-8
LC_MEASUREMENT = RU_RU.UTF-8
LC_IIDENTFICATION = RU_RU.UTF-8
LC_ALL =.

Change the settings of the current system language. To do this, run the following DPKG-RECONFIGURE :

sudo dpkg-reconfigure locales

then select the desired system language:

Select which language you want to use as the main system: