Terminal

ravi@home:~$ sudo add-apt-repository ppa:jonathonf/texlive
[sudo] password for ravi:
 Backport of latest available TeX Live packages.
Press [ENTER] to continue or ctrl-c to cancel adding it

gpg: keyring `/tmp/tmpd59cn8ks/secring.gpg' created
gpg: keyring `/tmp/tmpd59cn8ks/pubring.gpg' created
gpg: requesting key F06FC659 from hkp server keyserver.ubuntu.com
gpg: /tmp/tmpd59cn8ks/trustdb.gpg: trustdb created
gpg: key F06FC659: public key "Launchpad PPA for J Fernyhough" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
OK
ravi@home:~$ sudo apt-get install ppa-purge
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  asymptote-doc chktex clisp dvidvi fonts-lmodern fonts-texgyre lacheck
  latexdiff libffcall1 libfile-which-perl libptexenc1 libruby1.9.1 lmodern
  preview-latex-style ps2eps python-imaging-tk ruby ruby1.9.1 tex-common
  tex-gyre xindy xindy-rules
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  aptitude aptitude-common libcwidget3
Suggested packages:
  aptitude-doc-en aptitude-doc tasksel debtags libcwidget-dev
The following packages will be REMOVED:
  context
The following NEW packages will be installed:
  aptitude aptitude-common libcwidget3 ppa-purge
0 upgraded, 4 newly installed, 1 to remove and 264 not upgraded.
1 not fully installed or removed.
Need to get 2,384 kB of archives.
After this operation, 58.0 MB disk space will be freed.
Do you want to continue? [Y/n] y
Get:1 http://archive.ubuntu.com/ubuntu/ trusty/main aptitude-common all 0.6.8.2-1ubuntu4 [700 kB]
Get:2 http://archive.ubuntu.com/ubuntu/ trusty/main libcwidget3 amd64 0.5.16-3.5ubuntu1 [307 kB]
Get:3 http://archive.ubuntu.com/ubuntu/ trusty/main aptitude amd64 0.6.8.2-1ubuntu4 [1,371 kB]
Get:4 http://archive.ubuntu.com/ubuntu/ trusty/universe ppa-purge all 0.2.8+bzr57 [5,704 B]
Fetched 2,384 kB in 3s (705 kB/s)
(Reading database ... 275632 files and directories currently installed.)
Removing context (2016.05.17.20160523-1~ubuntu14.04.1york0) ...
unknown option: format
dpkg: error processing package context (--remove):
 subprocess installed post-removal script returned error exit status 1
Errors were encountered while processing:
 context
E: Sub-process /usr/bin/dpkg returned an error code (1)
ravi@home:~$ sudo ppa-purge ppa:jonathonf/texlive
sudo: ppa-purge: command not found