An update should always be performed before an upgrade or dist-upgrade.

The indexes of available packages are fetched from the location(s) specified in /etc/apt/sources.list (5). Used to re-synchronize the package index files from their sources.

If that doesn't work, then try re-building your sources.list using this tool: Ubuntu Sources List Generator Command Sudo apt -y upgrade & sudo apt autoremove -y

Processing triggers for libc-bin (2.23-0ubuntu11). Processing triggers for man-db (2.7.5-1). Selecting previously unselected package libpcre2-8-0:amd64. Done The following additional packages will be installed: git-man libpcre2-8-0 Suggested packages: git-daemon-run | git-daemon-sysvinit git-doc git-el git-email git-gui gitk gitweb git-cvs git-mediawiki git-svn The following NEW packages will be installed: libpcre2-8-0 The following packages will be upgraded: git git-man. Done Building dependency tree Reading state information. $ sudo apt-get install git -yes Reading package lists.

$ sudo add-apt-repository ppa:git-core/ppa -yes -update gpg: keyring `/tmp/tmpk8m4os6a/secring.gpg' created gpg: keyring `/tmp/tmpk8m4os6a/pubring.gpg' created gpg: requesting key E1DF1F24 from hkp server gpg: /tmp/tmpk8m4os6a/trustdb.gpg: trustdb created gpg: key E1DF1F24: public key 'Launchpad PPA for Ubuntu Git Maintainers' imported gpg: Total number processed: 1 gpg: imported: 1 (RSA: 1) OK

Install git redhat 8