Learn Ethical Hacking From Scratch-No Mana toolkit

Hello,
I am studying Zaid’s Ethical Hacking and want to run fake access point. But when run the command “leafpad /etc/mana.toolkit/hostapd.mana.conf” , I received the following error message ''Gtk-Message: 00:03:04.072: Failed to load module “gail”

** (leafpad:1567): WARNING **: 00:03:04.097: (…/atk-adaptor/bridge.c:1018):atk_bridge_adaptor_init: runtime check failed: (root)" and the leafpad open to empty page.
I run ‘apt install mana.toolkit’ and it return the following error message
'‘Reading package lists… Done
Building dependency tree… Done
Reading state information… Done
E: Unable to locate package mana.toolkit
E: Couldn’t find any package by glob ‘mana.toolkit’’
How may I fix this error
Thank You

Thanks I am able to trace the path and the path is
leafpad /etc/mana-toolkit/hostapd-mana.conf
It was successfully executed I am able to edit the Notepad