Hi !
i install odoo v16 on Ubuntu 20.04, add all App that i need and edit the new Website.

I will install new App, "Odoo 16 Accounting" from apps.odoo.com.

Copy all Data in Directory addon, klick in the left top Corner Main Menue, APPS and than UPDATES!

i recive this error:

An error occurred

Please use the copy button to report the error to your support service.

See detailsUncaughtPromiseError > TypeError

Uncaught Promise > Cannot read properties of undefined (reading 'writeText')

TypeError: Cannot read properties of undefined (reading 'writeText')
    at ClientErrorDialog.onClickClipboard (http://proddekogardina.webneu.ch/web/assets/debug/web.assets_backend.js:6468:37) (/web/static/src/core/errors/error_dialogs.js:36)
    at Object.mainEventHandler (http://proddekogardina.webneu.ch/web/assets/debug/web.assets_common.js:21654:25) (/web/static/lib/owl/owl.js:5484)
    at HTMLButtonElement.listener (http://proddekogardina.webneu.ch/web/assets/debug/web.assets_common.js:16504:20) (/web/static/lib/owl/owl.js:334

my odoo config

[options]
admin_passwd = xxxxxxxxxxxxxxxxxxxx
db_host = False
db_port = False
db_user = odoo16
db_password = False
addons_path = /odoo/odoo-server16/addons
logfile = /var/log/odoo/odoo.log

Postgres 

postgres=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------------+----------+----------+-------------+-------------+-----------------------
dekogardinaprod | odoo16 | UTF8 | C | en_US.UTF-8 | =Tc/odoo16 + 

                                                                                           odoo16=CTc/odoo16

thaks for you help

Philip