Libevent-2.1.8 required while upgrading to proxy-mysql-6.0.0, Ubuntu 20.04 LTS

[vkanta]

Dear Forum,
I have upgraded our Zabbix instance withour issues from 5.4 to 6.0 LTS. When i try to upgrade our proxy instance as well to 6.0.0 so that both versions are the same as required, i am unable to perform the instalation using the apt installer
i get the error that depependencies are missing;

libevent-2.1.6 (2.1.8.. ) but is not installable
libmysqlclient20 but is not installable
libsnmp30 , "" ""
Has this senario been somehow troubleshooted ?
any help will be appriciated
with kind regards
BK

[Atsushi]

I think you haven't set up the required Ubuntu repository. Did you install Ubuntu offline and remove the local DVD media settings from source.list? Check the contents of /etc/apt/sources.list. Perhaps the focal main repository settings are commented out or invalid access destinations are set.