While installing kodi I ran
sudo add-apt-repository ppa:team-xbmc/ppa
and got this error
: The repository 'https://deb.opera.com/opera-stable stable InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
Tried some fixes from the suggestions. Went to Software and updates but I got this error.
E:Read error - read (5: Input/output error), E:Read error - read (5: Input/output error), E:Read error - read (5:
These are my specs If they are helpful in any way.
AMD Sempron(tm) Processor 3000+
Operating System Ubuntu 18.04.4 LTS