By the way, this is Qiita's first post. Please take a good look.
When installing some app, try to run it with a command
apt install ●●●
*****:~$ apt install ●●● E: Unable to open lock file / var / lib / dpkg / lock-frontend --open (13: No permission) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root? *****:~$
Such a wording comes out. for that reason
sudo apt install ●●●
You need sudo before apt like. You can't install something without administrator privileges. If you think that this command is for the administrator to recognize it, Yoshi