$ sudo apt-get install flashplugin-nonfree
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
konqueror-nsplugins libflashsupport ttf-xfree86-nonfree xfs
The following NEW packages will be installed
flashplugin-nonfree
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/18.7kB of archives.
After this operation, 168kB of additional disk space will be used.
Preconfiguring packages ...
dpkg: regarding .../flashplugin-nonfree_9.0.124.0ubuntu2_amd64.deb containing flashplugin-nonfree:
adobe-flashplugin conflicts with flashplugin-nonfree
flashplugin-nonfree (version 9.0.124.0ubuntu2) is to be installed.
dpkg: error processing /var/cache/apt/archives/flashplugin-nonfree_9.0.124.0ubuntu2_amd64.deb (--unpack):
conflicting packages - not installing flashplugin-nonfree
Errors were encountered while processing:
/var/cache/apt/archives/flashplugin-nonfree_9.0.124.0ubuntu2_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)