It is not possible to install language packs.
by the command "sudo apt-get install language-pack-ru"
produces "Unable to locate package language-pack-ru"

 

I tried installing with orange pi zero and orange pi pc, but the result is the same.
On Linux Mint PCs, language packs are installed normally.

You need to start with Ubuntu variant:

  ___      _           _     _    ____ ____  
 / _ \  __| |_ __ ___ (_) __| |  / ___|___ \ 
| | | |/ _` | '__/ _ \| |/ _` | | |     __) |
| |_| | (_| | | | (_) | | (_| | | |___ / __/ 
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Welcome to Ubuntu Bionic with Armbian Linux 4.19.69-meson64
System load:   0.54 0.23 0.08  	Up time:       2:01 hours		
Memory usage:  19 % of 1976MB 	IP:            
CPU temp:      54°C           	
Usage of /:    7% of 29G    	

[ General system configuration (beta): armbian-config ]

Last login: Thu Sep  5 18:58:10 2019 from 

root@odroidc2:~# sudo apt-get install language-pack-ru
Reading package lists... Done
Building dependency tree       
Reading state information... Done
language-pack-ru is already the newest version (1:18.04+20180712).
language-pack-ru set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 5 not upgraded.

 

On 9/6/2019 at 12:00 AM, Igor said:

You need to start with Ubuntu variant:

pi@orangepizero:~$ sudo apt-get install language-pack-ru
[sudo] password for pi:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package language-pack-ru

Do you use Armbian? Please provide logs with:

armbianmonitor -u