Comment 4 for bug 1796469

For anyone using ansible this is how I rolled back to version 21

 - name: Removing awscli
   pip:
     name: awscli
     state: absent

 - name: Wait for sudo
   become: yes
   shell: while sudo fuser /var/lib/dpkg/lock >/dev/null 2>&1; do sleep 1; done;

 - name: remove aws kernel version
   become: yes
   apt:
     name: "{{ item }}"
     state: absent
   with_items:
     - linux-aws
     - linux-image-aws
     - linux-headers-aws

 - name: Wait for sudo
   become: yes
   shell: while sudo fuser /var/lib/dpkg/lock >/dev/null 2>&1; do sleep 1; done;

 - name: Pin aws kernel
   become: yes
   apt:
     deb: http://launchpadlibrarian.net/385721541/linux-image-aws_4.15.0.1021.21_amd64.deb

 - name: Wait for sudo
   become: yes
   shell: while sudo fuser /var/lib/dpkg/lock >/dev/null 2>&1; do sleep 1; done;

 - name: Pin aws kernel dependency
   become: yes
   apt:
     deb: http://launchpadlibrarian.net/385721540/linux-headers-aws_4.15.0.1021.21_amd64.deb

 - name: Wait for sudo
   become: yes
   shell: while sudo fuser /var/lib/dpkg/lock >/dev/null 2>&1; do sleep 1; done;

 - name: Pin aws kernel version
   become: yes
   apt:
     deb: http://launchpadlibrarian.net/385721538/linux-aws_4.15.0.1021.21_amd64.deb

 - name: Installing awscli
   pip:
     name: awscli