>sudo ppa-purge ppa:saiarcot895/chromium-beta
Updating packages lists
PPA to be removed: saiarcot895 chromium-beta
Package revert list generated:
 chromium-browser/rebecca chromium-codecs-ffmpeg-extra/rebecca

Disabling saiarcot895 PPA from
/etc/apt/sources.list.d/saiarcot895-chromium-beta-trusty.list
Updating packages lists
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Release 'rebecca' for 'chromium-browser' was not found
E: Release 'rebecca' for 'chromium-codecs-ffmpeg-extra' was not found
Unable to find an archive "rebecca" for the package "chromium-browser"
Unable to find an archive "rebecca" for the package "chromium-codecs-ffmpeg-extra"
Unable to find an archive "rebecca" for the package "chromium-browser"
Unable to find an archive "rebecca" for the package "chromium-codecs-ffmpeg-extra"
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 46 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.

PPA purged successfully using aptitude fallback