Can Ubuntu fix "Version 71.0+build2-0ubuntu0.16.04.1 cannot execute. 100% crash"

For diagnostic purposes please provide the output that you receive for the following commands:

uname -a
lsb_release -crid
apt-cache policy firefox

Probably Bug #1850529 caused by using a pre-release of Firefox 71, not from the official Ubuntu repositories but from elsewhere.

dad@dad314159:~$ uname -a
Linux dad314159 4.15.0-70-generic #79~16.04.1-Ubuntu SMP Tue Nov 12 14:01:10 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
dad@dad314159:~$ lsb_release -crid
Distributor ID: Ubuntu
Description: Ubuntu 16.04.6 LTS
Release: 16.04
Codename: xenial
dad@dad314159:~$ sudo apt-cache policy firefox
[sudo] password for dad:
firefox:
  Installed: 71.0+build2-0ubuntu0.16.04.1
  Candidate: 71.0+build2-0ubuntu0.16.04.1
  Version table:
 *** 71.0+build2-0ubuntu0.16.04.1 500
        500 http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status
     71.0~b12+build1-0ubuntu0.16.04.1 500
        500 http://ppa.launchpad.net/mozillateam/firefox-next/ubuntu xenial/main amd64 Packages
     70.0.1+build1-0ubuntu0.16.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
     45.0.2+build1-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
dad@dad314159:~$

I re-installed a mozilla firefox via download (version 70) and have it as default right now, I linked it into place (per the mozilla bug with link for "how to install" I noted above. Version 71 appeared as part of my updates which are controlled by the apt search. that search uses. The log for firefox is:

dad@dad314159:~$ cat /var/log/apt/history.log | grep firefox
Upgrade: python-psutil:amd64 (3.4.2-1, 3.4.2-1ubuntu0.1), libnss3-tools:amd64 (2:3.28.4-0ubuntu0.16.04.6, 2:3.28.4-0ubuntu0.16.04.8), rustc:amd64 (1.36.0+dfsg1+llvm-2ubuntu1~16.04.1, 1.37.0+dfsg1+llvm-1ubuntu1~16.04.1), libnss3-nssdb:amd64 (2:3.28.4-0ubuntu0.16.04.6, 2:3.28.4-0ubuntu0.16.04.8), ruby2.3:amd64 (2.3.1-2~ubuntu16.04.13, 2.3.1-2~ubuntu16.04.14), python3-psutil:amd64 (3.4.2-1, 3.4.2-1ubuntu0.1), libstd-rust-dev:amd64 (1.36.0+dfsg1+llvm-2ubuntu1~16.04.1, 1.37.0+dfsg1+llvm-1ubuntu1~16.04.1), amd64-microcode:amd64 (3.20191021.1ubuntu0.16.04.1, 3.20191021.1+really3.20180524.1~ubuntu0.16.04.2), libnss3-1d:amd64 (2:3.28.4-0ubuntu0.16.04.6, 2:3.28.4-0ubuntu0.16.04.8), ruby2.3-dev:amd64 (2.3.1-2~ubuntu16.04.13, 2.3.1-2~ubuntu16.04.14), rust-gdb:amd64 (1.36.0+dfsg1+llvm-2ubuntu1~16.04.1, 1.37.0+dfsg1+llvm-1ubuntu1~16.04.1), python-psutil-doc:amd64 (3.4.2-1, 3.4.2-1ubuntu0.1), libruby2.3:amd64 (2.3.1-2~ubuntu16.04.13, 2.3.1-2~ubuntu16.04.14), firefox-locale-en:amd64 (70.0.1+build1-0ubuntu0.16.04.1, 71.0+build2-0ubuntu0.16.04.1), cargo:amd64 (0.37.0-3ubuntu1~16.04.2, 0.38.0-0ubuntu1~16.04.1), debootstrap:amd64 (1.0.78+nmu1ubuntu1.9, 1.0.78+nmu1ubuntu1.10), libnss3:amd64 (2:3.28.4-0ubuntu0.16.04.6, 2:3.28.4-0ubuntu0.16.04.8), firefox:amd64 (70.0.1+build1-0ubuntu0.16.04.1, 71.0+build2-0ubuntu0.16.04.1), libnss3-dev:amd64 (2:3.28.4-0ubuntu0.16.04.6, 2:3.28.4-0ubuntu0.16.04.8), ruby2.3-tcltk:amd64 (2.3.1-2~ubuntu16.04.13, 2.3.1-2~ubuntu16.04.14)
Commandline: apt-get install --reinstall --install-suggests firefox
Reinstall: firefox:amd64 (71.0+build2-0ubuntu0.16.04.1)
Commandline: apt-get purge firefox
Purge: firefox:amd64 (71.0+build2-0ubuntu0.16.04.1)
Commandline: apt-get install --reinstall --install-suggests firefox
Install: firefox:amd64 (71.0+build2-0ubuntu0.16.04.1)
Commandline: apt-get purge firefox
Purge: firefox:amd64 (71.0+build2-0ubuntu0.16.04.1)
Commandline: apt-get install --reinstall --install-suggests firefox
Install: firefox:amd64 (71.0+build2-0ubuntu0.16.04.1)
Commandline: apt-get build-dep firefox
Commandline: apt remove firefox
Remove: firefox:amd64 (71.0+build2-0ubuntu0.16.04.1)
Commandline: apt install firefox
Install: firefox:amd64 (71.0+build2-0ubuntu0.16.04.1)
dad@dad314159:~$

dad@dad314159:~$ grep ^[^#] /etc/apt/sources.list /etc/apt/sources.list.d/*
/etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/ xenial main restricted
/etc/apt/sources.list:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial multiverse main universe restricted #Added by software-properties
/etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
/etc/apt/sources.list:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates multiverse main universe restricted #Added by software-properties
/etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/ xenial universe
/etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates universe
/etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/ xenial multiverse
/etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
/etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
/etc/apt/sources.list:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties
/etc/apt/sources.list:deb http://archive.canonical.com/ubuntu xenial partner
/etc/apt/sources.list:deb http://security.ubuntu.com/ubuntu xenial-security main restricted
/etc/apt/sources.list:deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse main universe restricted #Added by software-properties
/etc/apt/sources.list:deb http://security.ubuntu.com/ubuntu xenial-security universe
/etc/apt/sources.list:deb http://security.ubuntu.com/ubuntu xenial-security multiverse
/etc/apt/sources.list:deb http://download.virtualbox.org/virtualbox/debian xenial contrib
/etc/apt/sources.list.d/danielrichter2007-ubuntu-grub-customizer-xenial.list:deb http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu xenial main
/etc/apt/sources.list.d/danielrichter2007-ubuntu-grub-customizer-xenial.list.distUpgrade:deb http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu xenial main
/etc/apt/sources.list.d/danielrichter2007-ubuntu-grub-customizer-xenial.list.save:deb http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu xenial main
/etc/apt/sources.list.d/ddebs.list:deb http://ddebs.ubuntu.com xenial main restricted universe multiverse
/etc/apt/sources.list.d/ddebs.list:deb http://ddebs.ubuntu.com xenial-updates main restricted universe multiverse
/etc/apt/sources.list.d/ddebs.list.distUpgrade:deb http://ddebs.ubuntu.com xenial main restricted universe multiverse
/etc/apt/sources.list.d/ddebs.list.distUpgrade:deb http://ddebs.ubuntu.com xenial-updates main restricted universe multiverse
/etc/apt/sources.list.d/ddebs.list.save:deb http://ddebs.ubuntu.com xenial main restricted universe multiverse
/etc/apt/sources.list.d/ddebs.list.save:deb http://ddebs.ubuntu.com xenial-updates main restricted universe multiverse
/etc/apt/sources.list.d/getdeb.list.save:deb http://archive.getdeb.net/ubuntu xenial-getdeb games
/etc/apt/sources.list.d/hsoft-ubuntu-ppa-xenial.list:deb http://ppa.launchpad.net/hsoft/ppa/ubuntu xenial main
/etc/apt/sources.list.d/hsoft-ubuntu-ppa-xenial.list.distUpgrade:deb http://ppa.launchpad.net/hsoft/ppa/ubuntu xenial main
/etc/apt/sources.list.d/hsoft-ubuntu-ppa-xenial.list.save:deb http://ppa.launchpad.net/hsoft/ppa/ubuntu xenial main
/etc/apt/sources.list.d/kubuntu-ppa-ubuntu-backports-xenial.list:deb http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu xenial main
/etc/apt/sources.list.d/kubuntu-ppa-ubuntu-backports-xenial.list.distUpgrade:deb http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu xenial main
/etc/apt/sources.list.d/kubuntu-ppa-ubuntu-backports-xenial.list.save:deb http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian.gcc5.list:deb http://ppa.launchpad.net/kxstudio-debian/gcc5/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian.gcc5.list:deb http://ppa.launchpad.net/kxstudio-debian/gcc5-deps/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian.gcc5.list.distUpgrade:deb http://ppa.launchpad.net/kxstudio-debian/gcc5/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian.gcc5.list.distUpgrade:deb http://ppa.launchpad.net/kxstudio-debian/gcc5-deps/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian.gcc5.list.save:deb http://ppa.launchpad.net/kxstudio-debian/gcc5/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian.gcc5.list.save:deb http://ppa.launchpad.net/kxstudio-debian/gcc5-deps/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian.gcc5plus.list:deb http://ppa.launchpad.net/kxstudio-debian/kxstudio/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian.gcc5plus.list.distUpgrade:deb http://ppa.launchpad.net/kxstudio-debian/kxstudio/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian.gcc5plus.list.save:deb http://ppa.launchpad.net/kxstudio-debian/kxstudio/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian-ubuntu-ubuntus-xenial.list:deb http://ppa.launchpad.net/kxstudio-debian/ubuntus/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian-ubuntu-ubuntus-xenial.list.distUpgrade:deb http://ppa.launchpad.net/kxstudio-debian/ubuntus/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian-ubuntu-ubuntus-xenial.list.save:deb http://ppa.launchpad.net/kxstudio-debian/ubuntus/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-free.gcc5.list:deb [arch=amd64,i386] http://kxstudio.linuxaudio.org/repo/ gcc5 free
/etc/apt/sources.list.d/kxstudio-free.gcc5.list.distUpgrade:deb [arch=amd64,i386] http://kxstudio.linuxaudio.org/repo/ gcc5 free
/etc/apt/sources.list.d/kxstudio-free.gcc5.list.save:deb [arch=amd64,i386] http://kxstudio.linuxaudio.org/repo/ gcc5 free
/etc/apt/sources.list.d/kxstudio-free.list:deb [arch=amd64,i386] http://kxstudio.linuxaudio.org/repo/ stable free
/etc/apt/sources.list.d/kxstudio-free.list.distUpgrade:deb [arch=amd64,i386] http://kxstudio.linuxaudio.org/repo/ stable free
/etc/apt/sources.list.d/kxstudio-free.list.save:deb [arch=amd64,i386] http://kxstudio.linuxaudio.org/repo/ stable free
/etc/apt/sources.list.d/kxstudio-non-free.gcc5.list.save:deb [arch=amd64,i386] http://kxstudio.linuxaudio.org/repo/ gcc5 non-free
/etc/apt/sources.list.d/kxstudio-non-free.list.save:deb [arch=amd64,i386] http://kxstudio.linuxaudio.org/repo/ stable non-free
/etc/apt/sources.list.d/martin-salbaba-ubuntu-ppa_libimobiledevice-xenial.list:deb http://ppa.launchpad.net/martin-salbaba/ppa+libimobiledevice/ubuntu xenial main
/etc/apt/sources.list.d/martin-salbaba-ubuntu-ppa_libimobiledevice-xenial.list.distUpgrade:deb http://ppa.launchpad.net/martin-salbaba/ppa+libimobiledevice/ubuntu xenial main
/etc/apt/sources.list.d/martin-salbaba-ubuntu-ppa_libimobiledevice-xenial.list.save:deb http://ppa.launchpad.net/martin-salbaba/ppa+libimobiledevice/ubuntu xenial main
/etc/apt/sources.list.d/mjblenner-ubuntu-ppa-hal-xenial.list:deb http://ppa.launchpad.net/mjblenner/ppa-hal/ubuntu xenial main
/etc/apt/sources.list.d/mjblenner-ubuntu-ppa-hal-xenial.list.distUpgrade:deb http://ppa.launchpad.net/mjblenner/ppa-hal/ubuntu xenial main
/etc/apt/sources.list.d/mjblenner-ubuntu-ppa-hal-xenial.list.save:deb http://ppa.launchpad.net/mjblenner/ppa-hal/ubuntu xenial main
/etc/apt/sources.list.d/mono-official-stable.list:deb https://download.mono-project.com/repo/ubuntu stable-xenial main
/etc/apt/sources.list.d/mono-official-stable.list.distUpgrade:deb https://download.mono-project.com/repo/ubuntu stable-xenial main
/etc/apt/sources.list.d/mono-official-stable.list.save:deb https://download.mono-project.com/repo/ubuntu stable-xenial main
/etc/apt/sources.list.d/mozillateam-ubuntu-firefox-next-xenial.list:deb http://ppa.launchpad.net/mozillateam/firefox-next/ubuntu xenial main
/etc/apt/sources.list.d/mscore-ubuntu-ubuntu-mscore-stable-xenial.list:deb http://ppa.launchpad.net/mscore-ubuntu/mscore-stable/ubuntu xenial main
/etc/apt/sources.list.d/mscore-ubuntu-ubuntu-mscore-stable-xenial.list.distUpgrade:deb http://ppa.launchpad.net/mscore-ubuntu/mscore-stable/ubuntu xenial main
/etc/apt/sources.list.d/mscore-ubuntu-ubuntu-mscore-stable-xenial.list.save:deb http://ppa.launchpad.net/mscore-ubuntu/mscore-stable/ubuntu xenial main
/etc/apt/sources.list.d/nilarimogard-ubuntu-webupd8-xenial.list:deb http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial main
/etc/apt/sources.list.d/nilarimogard-ubuntu-webupd8-xenial.list.distUpgrade:deb http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial main
/etc/apt/sources.list.d/nilarimogard-ubuntu-webupd8-xenial.list.save:deb http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial main
/etc/apt/sources.list.d/qtcam-ubuntu-xenial-xenial.list:deb http://ppa.launchpad.net/qtcam/xenial/ubuntu xenial main
/etc/apt/sources.list.d/qtcam-ubuntu-xenial-xenial.list.distUpgrade:deb http://ppa.launchpad.net/qtcam/xenial/ubuntu xenial main
/etc/apt/sources.list.d/qtcam-ubuntu-xenial-xenial.list.save:deb http://ppa.launchpad.net/qtcam/xenial/ubuntu xenial main
/etc/apt/sources.list.d/saiarcot895-ubuntu-flightgear-xenial.list:deb http://ppa.launchpad.net/saiarcot895/flightgear/ubuntu xenial main
/etc/apt/sources.list.d/saiarcot895-ubuntu-flightgear-xenial.list.distUpgrade:deb http://ppa.launchpad.net/saiarcot895/flightgear/ubuntu xenial main
/etc/apt/sources.list.d/saiarcot895-ubuntu-flightgear-xenial.list.save:deb http://ppa.launchpad.net/saiarcot895/flightgear/ubuntu xenial main
/etc/apt/sources.list.d/teamviewer.list:deb http://linux.teamviewer.com/deb stable main
/etc/apt/sources.list.d/teamviewer.list.distUpgrade:deb http://linux.teamviewer.com/deb stable main
/etc/apt/sources.list.d/teamviewer.list.dpkg-old:deb http://linux.teamviewer.com/deb stable main
/etc/apt/sources.list.d/teamviewer.list.save:deb http://linux.teamviewer.com/deb stable main
/etc/apt/sources.list.d/thopiekar-ubuntu-miraclecast-xenial.list:deb http://ppa.launchpad.net/thopiekar/miraclecast/ubuntu xenial main
/etc/apt/sources.list.d/thopiekar-ubuntu-miraclecast-xenial.list.distUpgrade:deb http://ppa.launchpad.net/thopiekar/miraclecast/ubuntu xenial main
/etc/apt/sources.list.d/thopiekar-ubuntu-miraclecast-xenial.list.save:deb http://ppa.launchpad.net/thopiekar/miraclecast/ubuntu xenial main
/etc/apt/sources.list.d/tor.list:deb https://deb.torproject.org/torproject.org xenial main
/etc/apt/sources.list.d/tor.list:deb-src https://deb.torproject.org/torproject.org xenial main
/etc/apt/sources.list.d/tor.list.distUpgrade:deb https://deb.torproject.org/torproject.org xenial main
/etc/apt/sources.list.d/tor.list.distUpgrade:deb-src https://deb.torproject.org/torproject.org xenial main
/etc/apt/sources.list.d/tor.list.save:deb https://deb.torproject.org/torproject.org xenial main
/etc/apt/sources.list.d/tor.list.save:deb-src https://deb.torproject.org/torproject.org xenial main
/etc/apt/sources.list.d/ubuntu-desktop-ubuntu-ubuntu-make-xenial.list:deb http://ppa.launchpad.net/ubuntu-desktop/ubuntu-make/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-desktop-ubuntu-ubuntu-make-xenial.list.distUpgrade:deb http://ppa.launchpad.net/ubuntu-desktop/ubuntu-make/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-desktop-ubuntu-ubuntu-make-xenial.list.save:deb http://ppa.launchpad.net/ubuntu-desktop/ubuntu-make/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-mozilla-security-ubuntu-ppa-xenial.list:deb http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-mozilla-security-ubuntu-ppa-xenial.list.distUpgrade:deb http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-mozilla-security-ubuntu-ppa-xenial.list.save:deb http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list:deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list.distUpgrade:deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list.save:deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
/etc/apt/sources.list.d/virtualbox.list.save:deb http://download.virtualbox.org/virtualbox/debian xenial contrib
/etc/apt/sources.list.d/webupd8team-ubuntu-tor-browser-xenial.list:deb http://ppa.launchpad.net/webupd8team/tor-browser/ubuntu xenial main
/etc/apt/sources.list.d/webupd8team-ubuntu-tor-browser-xenial.list.distUpgrade:deb http://ppa.launchpad.net/webupd8team/tor-browser/ubuntu xenial main
/etc/apt/sources.list.d/webupd8team-ubuntu-tor-browser-xenial.list.save:deb http://ppa.launchpad.net/webupd8team/tor-browser/ubuntu xenial main
/etc/apt/sources.list.d/webupd8team-ubuntu-y-ppa-manager-xenial.list:deb http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu xenial main
/etc/apt/sources.list.d/webupd8team-ubuntu-y-ppa-manager-xenial.list.distUpgrade:deb http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu xenial main
/etc/apt/sources.list.d/webupd8team-ubuntu-y-ppa-manager-xenial.list.save:deb http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu xenial main
/etc/apt/sources.list.d/yannubuntu-ubuntu-boot-repair-xenial.list:deb http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu xenial main
/etc/apt/sources.list.d/yannubuntu-ubuntu-boot-repair-xenial.list.distUpgrade:deb http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu xenial main
/etc/apt/sources.list.d/yannubuntu-ubuntu-boot-repair-xenial.list.save:deb http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu xenial main
dad@dad314159:~$

Yes it appears in your updates as you have added a PPA for Firefox.

If you make a new profile now Firefox version 70 is installed, does it work OK?

The output of "apt-cache policy firefox" (sudo not required for that command) confirms:

  Version table:
  *** 71.0+build2-0ubuntu0.16.04.1 500
         500 http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu xenial/main amd64

The version that you have intalled is coming from a PPA.
Please look at its description https://launchpad.net/~ubuntu-mozilla-security/+archive/ubuntu/ppa
"Unless you are testing updates, you should NOT install packages from this PPA."

This PPA is a staging area of the Mozilla Security Team, and they are aware that the version that currently is there does not work ( Bug #1850529 )

I recommend that you remove that PPA from your list of repository sources.
sudo rm /etc/apt/sources.list.d/ubuntu-mozilla-security-ubuntu-ppa-xenial.list
and probably also
sudo rm /etc/apt/sources.list.d/mozillateam-ubuntu-firefox-next-xenial.list

@Manfreed:
I made ppa updates suggested. I will now try to recover my histories and logins from the unusable "EXPERIMENTAL" Forefox. As noted elsewhere, I am unaware of how these ppa modifications tool place.