I found another way to upgrade version 13 to version 14 by installing version 13 on ubuntu 22.04 and then restoring the data from version 13 (installed originally on ubuntu 20.04). After the data restore was done I then followed the steps from this URL:
Erpnext upgraded from version 13 to version 14 with a few errors and from the size of the databackup file and the error I see while using the application that I cannot trust the data on the upgraded system.
Has anybody successfully upgraded ERPNext version 13 to 14 with a trustable data? If so, can you please share the instructions? Although version 14 was launched due to the issue in upgrade I am unable to implement and use version 14.