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I get a message which says "Package Managers cannot be resolved" when I attempt to install regular updates.

When I try to install from the Terminal with sudo apt-get update I get the following:

Reading package lists... Done
W: There is no public key available for the following key IDs:
1397BC53640DB551
W: Ignoring Provides line with DepCompareOp for package libreoffice-l10n
W: Ignoring Provides line with DepCompareOp for package libreoffice-l10n
W: Ignoring Provides line with DepCompareOp for package libreoffice-l10n
W: Ignoring Provides line with DepCompareOp for package libreoffice-l10n
W: Ignoring Provides line with DepCompareOp for package libreoffice-l10n
W: Ignoring Provides line with DepCompareOp for package libreoffice-l1

I can't seem to install updates anymore. What is the issue? I am using Ubuntu 14.04.5 LTS.

karel
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jps07
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    Possible duplicate of [Ubuntu 14.04: Error with "apt-get update": W: Ignoring Provides line with DepCompareOp](https://askubuntu.com/questions/880447/ubuntu-14-04-error-with-apt-get-update-w-ignoring-provides-line-with-depcom) – Nick Weinberg Apr 16 '17 at 13:12
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    Possible duplicate of [There is no public key available for the following key IDs 1397BC53640DB551](https://askubuntu.com/questions/766883/there-is-no-public-key-available-for-the-following-key-ids-1397bc53640db551) – Elder Geek Apr 18 '17 at 18:45
  • Try importing the gpg key with the following command: gpg --recv-key 1397BC53640DB551 – user678919 Apr 16 '17 at 22:26
  • Thanks but this did not work. Same error appears – jps07 Apr 18 '17 at 01:04

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