Here is my own guide to fix the issues that has been encountered during the installation
I begin by this guide : Frappe & ERPNext v16 Installation Ubuntu 25 - #20 by poypoy1-dot
When I start my Bench instance, I encountered several little erros, I fix them by upgrading some libs.
After that my Bench start runs correctly and I access the ERP.
I test the ERP by saving some datas and I have issues saving “ADDRESSES”, I post a thread on the forum to have some help → Error in saving Customer Address
I discovered that there was a desynchronisation between my server and the ErpNext Cloud (I had previously created an account to test the application).
So I had DOCTYPEs that were not synchronised, data was missing…
I also checked the versions of all my libraries and Python was only 3.12 instead of 3.14…
So I looked for a solution on the forum and followed this protocol to correctly update FRAPPE, ERPNext and HRMS to v16
→ Guide to upgrading bench Frappe and ERPNext from v15 to v16 on Debian 12 - #15 by Rick-Hard89
So I ended up with library UPGRADES and UPGRADES in Frappe and ERPNext…
It wasn’t easy because the build takes a long time on my VM…
After a few hours of struggle, I managed to get a stable system.
So I finalised my installation by switching to PRODUCTION mode, following this guide → Enterprise Production Setup & Security (ERPNext v16 / Ubuntu 25)
I restart all the services and my ERPNext runs well. I save some datas : customer, addresses, items, quotation, invoices but an error remain when I want to print a PDF.
An error due to the lack of wkhtmltopdf library…
I decide to install the last version of this library by running some piece of code :
apt install wkhtmltopdf
....
depends of xfont...
apt install xfont...
wget https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6.1-2/wkhtmltox_0.12.6.1-2.jammy_amd64.deb
dpkg --install wkhtmltox_0.12.6.1-2.jammy_amd64.deb
And finally all is running well !