Thanks a lot the problem is solved , I am able now to upgrade normally thanks a lot for your help and support
$uname -mrs Linux 5.4.0-42-generic x86_64
$cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=20.04 DISTRIB_CODENAME=focal DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"
Thanks a lot the problem is solved ,
I am able now to upgrade normally
thanks a lot for your help and support
$uname -mrs
Linux 5.4.0-42-generic x86_64
$cat /etc/lsb-release RELEASE= 20.04 CODENAME= focal DESCRIPTION= "Ubuntu 20.04.1 LTS"
DISTRIB_ID=Ubuntu
DISTRIB_
DISTRIB_
DISTRIB_