I installed ibus(m17n) and added a telugu input method. I also installed telugu font package(fonts-telu). But I am not able to use telugu(after selecting it in the task bar icon) input method in libreWriter. Can someone suggest what to do? I am very new to linux. Thank you.
I'm assuming you are referring to LibreOffice Writer. You need to install the Telugu package for LibreOffice. Open a terminal and paste or type this in:
sudo apt install libreoffice-l10n-te
You may also be interested in some other Telugu packages that are available such as the list this creates:
apt search Telugu