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I did another synaptic reload and got the same messages ...

W: There is no public key available for the following key IDs:
7638D0442B90D010
W: There is no public key available for the following...

Thanks Werner.
I followed the instructions you supplied and synaptic package manager is now working with my existing persistent memory.
I don't do upgrades.
I use synaptic to get packages like...

I am running Knoppix 7.4.2 from a flash drive. I have had no issues since I first installed it to flash drive in 2014 and created a persistent memory file. I have done several synaptic reloads with...

I installed Knoppix 7.2 DVD on a flashdrive. I also had trouble with the time. I read through the information posted by others.
I editted this file on my flash drive ... ...

Hello Werner,

Up until now I have just been using Knoppix from the DVD , so 5.3.1 was practical for me.

I have been doing scientific programming for years but never got into computer system...

I am still using the Knoppix 5.3.1 DVD . It has many of the utilities I need ... Gnu gfortran, Gnu C, Nedit, Perl, gawk ...
It is a nice environment to do some engineering programming in mixed...