Aqui Problema de instalação da Anbox @karel disse:
WhatsApp also asks if you want to give the app permission to access the files on your device which is another security risk in my opinion. I think it's OK to give WhatsApp permission to access the files on my phone, but I don't want to give the app permission to access the files on my computer. Permissions are a matter of fundamental importance in Linux. You should be very careful about giving permissions to an application that it doesn't already have by default, and the telegram-latest snap package in Ubuntu 16.04 has better support than WhatsApp including Telegram Calls voice calls which are currently available to users around the world.
Eu estou querendo saber, existe uma maneira de ter absoluta certeza de que os aplicativos instalados no Anbox não podem obter acesso a arquivos no computador? Talvez a execução do Anbox no Firejail possa impedir isso?