[Merge] ~danilogondolfo/network-manager/+git/ubuntu-1:preinst_script_fix into network-manager:ubuntu/master

[Danilo Egea Gondolfo]

Danilo Egea Gondolfo has proposed merging ~danilogondolfo/network-manager/+git/ubuntu-1:preinst_script_fix into network-manager:ubuntu/master.

Requested reviews:
  Network-manager (network-manager)
Related bugs:
  Bug #2021937 in network-manager (Ubuntu): "preinst writes to /root"
  https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/2021937

For more details, see:
https://code.launchpad.net/~danilogondolfo/network-manager/+git/ubuntu-1/+merge/443876

Use /var/lib/NetworkManager for backups in the preinst script. As part of the netplan everywhere project we started creating backups of the existing Network Manager configuration before installation on /root but this is causing some problems. See https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/2021937
-- 
Your team Network-manager is requested to review the proposed merge of ~danilogondolfo/network-manager/+git/ubuntu-1:preinst_script_fix into network-manager:ubuntu/master.
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