Eu procurei neste site por este erro que estou encontrando:

Stopping ADB server failed (code -1).
Unable to run 'adb': Cannot run program "/home/ariel/Downloads/adt-bundle-linux-x86_64/sdk/platform-tools/adb": error=2, No such file or directory.
Starting ADB server failed (code -1).

Eu usei este comando no terminal fornecido neste tópico.

Android SDK em uma máquina linux de 64 bits

EDIT: eu tentei usar este comando no terminal:

sudo apt-get install ia32-libs

Infelizmente, não fez nada e mostrou isso:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libc6-i386 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libc6-i386' has no installation candidate