If you are having trouble installing gef on Ubuntu 16.04 32-bit, you may follow these steps:

Install python3.6 and python3.6-dev:

sudo add-apt-repository -y ppa:jblgf0/python

sudo apt-get update

sudo apt-get install python3.6 python3.6-dev

Install texinfo package (since you would the makeinfo command to be available for successful installation of gdb):

sudo apt install texinfo

Download gdb 8.2 from https://ftp.gnu.org/gnu/gdb/gdb-8.2.tar.gz, then unpack and cd to the folder.

To start compilation, you have to explicitly instruct the compiler to use python3.6 through the configuration script:

./configure --with-python=/usr/bin/python3.6

make

sudo make install

After that, just install gef normally per the instructions on the website:

bash -c "$(curl -fsSL https://gef.blah.cat/sh)"

That’s it, Enjoy!