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sudo apt-get upgrade
E: invalid record in the preferences file etc/apt/preferences.d/huayra-turtleart-pinning-900, no package header
File [etc/apt/preferences.d/huayra-turtleart-pinning-900] inside is:
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Package: turtleart
Pin: version 106*
Pin priority:900
My version is Huayra but totally based on Debian, as you can see from this information:
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alumno@huayra:~$ cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
NAME="Debian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"