tasksel apt-get failed (100)

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tasksel apt-get failed (100)

How to resolve tasksel 100 error.

Make sure your repository from location /etc/apt/sources.list is your preferred target release. Also remove any .repo files from /etc/apt/sources.list.d/

The original sources.list from Debian 8 looks like below

 

# cat /etc/apt/sources.list

deb http://ftp.us.debian.org/debian/ jessie main
deb-src http://ftp.us.debian.org/debian/ jessie main

deb http://security.debian.org/ jessie/updates main contrib
deb-src http://security.debian.org/ jessie/updates main contrib

# jessie-updates, previously known as 'volatile'
deb http://ftp.us.debian.org/debian/ jessie-updates main contrib
deb-src http://ftp.us.debian.org/debian/ jessie-updates main contrib

 

Now we have to use the Apt-Pin feature to get the correct default release tag for our apt downgrade

Modify or create the file /etc/apt/preferences and put following text

# vim /etc/apt/preferences

Package: *
Pin: release a=stable
Pin-Priority: 1001


Note: Replace a=stable with n=wheezy if you are running not the SID but Jessie final release.

 

Now we just run the below commands to finish the up/downgrade process

# apt-get update 
# apt-get upgrade -y
# apt-get dist-upgrade -y

 

If packages are failing on up/downgrade you might need to purge the package in question

 

# apt-get purge nginx-extras

 

And reinstall them with apt-get install nginx-extras after purging it.

# apt-get install nginx-extras

 

The procedure works for resolving a mixed environment correcting packages installed with multiple repositories.

Enjoy

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