arduino YUN V2.0 problem with package installation

Hi, we bought a new Arduino YUN version (V2 = ABX00020). We want to install some package with these commands, who worked in the past with the last arduino version :
opkg update
opkg install kmod-rt2800-lib kmod-rt2800-usb kmod-rt2x00-lib kmod-rt2x00-usb python-openssl ftplib

Everything looks good, except for the ftplib … we have these messages after the last command :

Package kmod-rt2800-lib (4.9.91+2017-11-01-5) installed in root is up to date.
Package kmod-rt2800-usb (4.9.91+2017-11-01-5) installed in root is up to date.
Package kmod-rt2x00-lib (4.9.91+2017-11-01-5) installed in root is up to date.
Package kmod-rt2x00-usb (4.9.91+2017-11-01-5) installed in root is up to date.
Package python-openssl (2.7.14-10) installed in root is up to date.
Unknown package 'ftplib'.
Collected errors:

  • opkg_install_cmd: Cannot install package ftplib.

Can you help us to understand what happened. Thank you.

root@Arduino:~# wget http://downloads.arduino.cc/openwrtyun/1/packages/ftplib_3.1-1-1_ar71xx.ipk
Downloading 'http://downloads.arduino.cc/openwrtyun/1/packages/ftplib_3.1-1-1_ar71xx.ipk'
Connecting to 158.69.81.61:80
Writing to 'ftplib_3.1-1-1_ar71xx.ipk'
Cannot open output file: File exists
root@Arduino:~# opkg install ftplib_3.1-1-1_ar71xx.ipk
Unknown package 'ftplib'.
Collected errors:

  • pkg_hash_fetch_best_installation_candidate: Packages for ftplib found, but incompatible with the architectures configured
  • opkg_install_cmd: Cannot install package ftplib.

root directly with http don't work more

jplam29:
Cannot open output file: File exists

Sounds like the package file (or some other file) already exists and it cannot overwrite it. Is the file set to read only? Is the drive full? Is the drive or the file corrupted?

root directly with http don't work more

I have no idea what you're trying to say here.