Anik Samiur Rahman's questions

I've just installed sage with the command:

sudo apt-get install sagemath

But every time I try to start sage, following error show up:

$ sage
Traceback (most recent call last):
File "/usr/share/sagemath/bin/sage-ipython", line 7, in module
from sage.repl.interpreter import SageTerminalApp
ImportError: No module named repl.interpreter

Python 2.7 is the default on my PC. I tried to change it to python3 from "/usr/share/sagemath/bin/sage-ipython". But that didn't solve the problem. So, I removed that change. I have Ipython is installed and pip install sage says that sage is already available in /home/anik/.local/lib/python2.7/site-packages. Finally I've located interpreter.py file in /usr/lib/python2.7/dist-packages/sage/repl. So it seems nothing is missing. So why ipython can't locate this file and launch sage? I'm out of my depth.

I'm on Ubuntu 18.04. To install Avro I first downloaded the latest version(avro_2.1-3_all.deb) from github using command

$ wget "https://github.com/ugcoder/avro/releases/download/v2.1/avro_2.1-3_all.deb"

Then installed:

$ sudo dpkg -i avro_2.1-3_all.deb

Then finally ran these command:

$ sudo apt-get install -fy
$ ibus restart

Before these download and installation, I entered "Language Support" and ensured that the box for Bangla is ticked in "Installed language". Also ensured that Keyboard input method id IBus.

Now once avro is installed, I went to settings and added Bengali(Avro Phonetic)" as input source.

Now I opened LibreOffice Writer switched to Avro using super+space. Everything was set, only all that is coming are English letters. Same happened on gedit, same happening now: I wrote this whole question with Avro selected!

What's happening?

To enquire, I checked to keyboard layout of Avro Phonetic. Surprisingly avro's keyboard layout is identical to English(US)! I then manually downloaded the avro fonts and copied them to /usr/share/fonts/truetype and restarted my PC. The result is same. Now what can I do to write Bangla with Avro?