Certainly.

1. Original copy of /etc/hosts before starting network-manager:

"""
127.0.0.1       localhost
127.0.1.1       balanced-tree

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
"""

2. /etc/hosts after starting network-manager, but before connecting to a
network:

"""
127.0.0.1       balanced-tree   localhost.localdomain   localhost
::1     balanced-tree   localhost6.localdomain6 localhost6
127.0.1.1       balanced-tree

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
"""

3. /etc/hosts after connecting to a network:

"""
18.111.118.108  balanced-tree   # Added by NetworkManager
127.0.0.1       localhost.localdomain   localhost
::1     balanced-tree   localhost6.localdomain6 localhost6
127.0.1.1       balanced-tree

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
"""

4. /etc/hosts after disconnecting from the network:
(same as #3, where “18.111.118.108 balanced-tree” is now unreachable)

and...@balanced-tree:~$ ping `hostname`
connect: Network is unreachable

5. /etc/hosts after stopping network-manager:
(same as #3 and #4)

-- 
Leaves unreachable entries in /etc/hosts when stopping network
https://bugs.launchpad.net/bugs/632896
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