[ubuntu] Error on updating

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http://ubuntuforums.org – Hello to all. I got this error while I run the update command. Fetched 466 kB in 9s (48.9 kB/s) W: GPG error: http://www.bchemnet.com debian Release: The following signatures were invalid: BADSIG C95104E509BAC46D Samung Unified Linux Driver Repository W: Failed to fetch copy:/var/lib/apt/lists/partial/liveusb.info_multisystem_depot_dists_all_main_i18n _Translation-en%5fUS Encountered a section with no Package: header W: Failed to fetch gzip:/var/lib/apt/lists/partial/liveusb.info_multisystem_depot_dists_all_main_i18n _Translation-en Encounte (Hardware)