Gunakan lsb_release seperti ini lsb_release -a

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.4 LTS
Release:	18.04
Codename:	bionic

Atau versi singkat lsb_release -d

Description:	Ubuntu 18.04.4 LTS

Cara lain

Bisa gunakan hostnamectl

Static hostname: localhost
      Icon name: computer-vm
        Chassis: vm
     Machine ID: 8bc38c38a48b464f8fd7db5d5b59ba87
        Boot ID: 788f7ad6b7614cfc9ac104bf9b834601
 Virtualization: kvm
Operating System: Ubuntu 18.04.4 LTS
         Kernel: Linux 4.15.0-88-generic
   Architecture: x86-64

Mudah bukan?

Referensi