[Docs] Errors when following installation on Linux via apt

[Nikolai2038]

When I follow installation instructions for Linux via apt, I encountered two errors:

1. When executing:

   sudo gpg --no-default-keyring --keyring /etc/apt/keyrings/bruno.gpg --keyserver keyserver.ubuntu.com --recv-keys 9FA6017ECABE0266

   I got error (exit code 2):

   gpg: failed to create temporary file '/root/.gnupg/.#lk0x0000560afa039a50.PCNAME.7625': No such file or directory
   gpg: connecting dirmngr at '/root/.gnupg/S.dirmngr' failed: No such file or directory
   gpg: keyserver receive failed: No dirmngr
   

   I solved it by creating directory:

   sudo mkdir -p /root/.gnupg

2. Second error I got when I already installed bruno and tried to launch it:

   bruno

   I got error (exit code 127):

   bruno: error while loading shared libraries: libasound.so.2: cannot open shared object file: No such file or directory
   

   Solved it by installing libasound2:

   sudo apt-get install libasound2

I use WSL2 Debian in Windows 11. I will create PR to add those instructions to READMEs.