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Duplicity is failing to make backup.
It produces error message: see attached 000_Error_message.png

After starting duplicity from terminal, I got much better error message:
unim95@ubuntu-BitFenix-Prodigy:~$ duplicity 
bash: /usr/bin/duplicity: /usr/bin/python2: bad interpreter: No such file or 
directory

After searching system for python2 i found, that there is no python2 executable
unim95@ubuntu-BitFenix-Prodigy:~$ locate python2 | grep -v lib | grep -v man | 
grep -v doc | grep -v include
/etc/python2.7
/etc/python2.7/sitecustomize.py
/snap/core/8689/usr/share/bash-completion/completions/python2
/snap/core/8689/usr/share/dh-python/dh_python2
/snap/core/8689/usr/share/dh-python/dist/cpython2_fallback
/snap/core/8935/usr/share/bash-completion/completions/python2
/snap/core/8935/usr/share/dh-python/dh_python2
/snap/core/8935/usr/share/dh-python/dist/cpython2_fallback
/usr/bin/python2-futurize
/usr/bin/python2-pasteurize
/usr/bin/python2.7
/usr/bin/python2.7-config
/usr/bin/waitress-serve-python2
/usr/bin/x86_64-linux-gnu-python2.7-config
/usr/share/app-install/desktop/idle-python2.7:idle-python2.7.desktop
/usr/share/applications/python2.7.desktop
/usr/share/bash-completion/completions/python2
/usr/share/binfmts/python2.7
/usr/share/dh-python/dh_python2
/usr/share/dh-python/dist/cpython2_fallback
/usr/share/lintian/overrides/python2.7
/usr/share/lintian/overrides/python2.7-minimal
/usr/share/pixmaps/python2.7.xpm


Default python is:
unim95@ubuntu-BitFenix-Prodigy:~$ python --version
Python 2.7.17


Duplicity version: 
unim95@ubuntu-BitFenix-Prodigy:~$ dpkg -s duplicity
Package: duplicity
Status: install ok installed
Priority: optional
Section: utils
Installed-Size: 1064
Maintainer: Ubuntu Developers <ubuntu-devel-disc...@lists.ubuntu.com>
Architecture: amd64
Version: 0.7.17-0ubuntu1.1
Depends: libc6 (>= 2.4), librsync1 (>= 0.9.6), python (<< 2.8), python (>= 
2.7~), python-fasteners, python:any (<< 2.8), python:any (>= 2.7.5-5~), 
python-lockfile (>> 1:0.9), gnupg | gnupg1
Suggests: rsync, python-paramiko, python-pexpect, python-urllib3, 
python-oauthlib, python-boto, ncftp, python-cloudfiles, lftp, python-gdata, 
tahoe-lafs, python-swiftclient
Description: encrypted bandwidth-efficient backup
 Duplicity backs directories by producing encrypted tar-format volumes
 and uploading them to a remote or local file server. Because duplicity
 uses librsync, the incremental archives are space efficient and only
 record the parts of files that have changed since the last backup.
 Because duplicity uses GnuPG to encrypt and/or sign these archives, they
 will be safe from spying and/or modification by the server.
Homepage: http://duplicity.nongnu.org/
Original-Maintainer: Alexander Zangerl <a...@debian.org>

Python2 version:
unim95@ubuntu-BitFenix-Prodigy:~$ dpkg -s python 
Package: python
Status: install ok installed
Priority: optional
Section: python
Installed-Size: 624
Maintainer: Ubuntu Developers <ubuntu-devel-disc...@lists.ubuntu.com>
Architecture: amd64
Multi-Arch: allowed
Source: python-defaults
Version: 2.7.15~rc1-1
Replaces: python-dev (<< 2.6.5-2)
Provides: python-ctypes, python-email, python-importlib, python-profiler, 
python-wsgiref
Depends: python2.7 (>= 2.7.15~rc1-1~), libpython-stdlib (= 2.7.15~rc1-1)
Pre-Depends: python-minimal (= 2.7.15~rc1-1)
Suggests: python-doc (= 2.7.15~rc1-1), python-tk (>= 2.7.15~rc1-1~)
Breaks: update-manager-core (<< 0.200.5-2)
Conflicts: python-central (<< 0.5.5)
Description: interactive high-level object-oriented language (default version)
 Python, the high-level, interactive object oriented language,
 includes an extensive class library with lots of goodies for
 network programming, system administration, sounds and graphics.
 .
 This package is a dependency package, which depends on Debian's default
 Python version (currently v2.7).
Original-Maintainer: Matthias Klose <d...@debian.org>
Homepage: http://www.python.org/
Cnf-Extra-Commands: python
Cnf-Priority-Bonus: 3

OS:
unim95@ubuntu-BitFenix-Prodigy:~$ cat /etc/os-release 
NAME="Ubuntu"
VERSION="18.04.4 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.4 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/";
SUPPORT_URL="https://help.ubuntu.com/";
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic

FS used: ext4.

** Affects: duplicity
     Importance: Undecided
         Status: New

** Affects: python2.7 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: duplicity python
-- 
Duplicity is not working
https://bugs.launchpad.net/bugs/1871763
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seeded packages, which is subscribed to python2.7 in Ubuntu.

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