Code provided in the official webpage not working.
My Os is Ubuntu Mate
“sudo apt-get install keyman ibus-keyman onboard”
Reading package lists… Done
*Building dependency tree *
Reading state information… Done
Package ibus-keyman is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package ‘ibus-keyman’ has no installation candidate
any help would be much appreciated.