Thanks! For some reason your /etc/apt/sources.list{.d/} weren't attached, but it seems that problem is there. Can you please open Software Sources, disable everything under "Other Software" tab (see https://help.ubuntu.com/community/Repositories/Ubuntu#Removing_.26_Disabling_Repositories), and then try to upgrade again?
Thanks! sources. list{.d/ } weren't attached, but it seems that problem is there. Can you please open Software Sources, disable everything under "Other Software" tab (see https:/ /help.ubuntu. com/community/ Repositories/ Ubuntu# Removing_ .26_Disabling_ Repositories), and then try to upgrade again?
For some reason your /etc/apt/