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[LUG] sources woes

 

Sorry for the long story. Section 1 is background, section 2 is the current problem.
1.  Having been away for 6 weeks consorting with the French and Spanish, 
on my return I thought my aging desktop could do with a face-lift. (Nice 
to get back to reasonably fast broadband and computer after 6 weeks on a 
tablet and smartphone on very unreliable wifi.)  I put in a 1 TB drive 
and another 4 Gb RAM, partitioned the new drive and copied the /root and 
/home partitions from the old drive to the new with DD. (Running Mint 16)
Disconnected the old HD and no joy.  I found that this was due to the 
old drive root being sda3 and the new one sda1 thus confusing Grub. 
Sorted that and decided to apply Mr Meowski's infallible method of 
upgrading as I find Mint 17 has appeared. This worked but with one or 
two funnies which I haven't the details of now. But I got it working and 
it ran for a couple of hours OK but coming back to it I found a blank 
screen and the HD running constantly.  After waiting an hour I reset and 
the system was screwed, no boot, can't find an operating system, a day 
of trying this and that using a laptop to get info off the net.  I 
disconnected the new HD and reconnected the old HD and lo and behold, 
that was borked too. I eventually found that there was a hardware fault, 
processor problem I think, which had screwed the root somehow. Give up time.
2. I have another computer, no working HD, so I fitted the new drive to 
that. I didn't have a copy of the Mint 17 iso so I installed Mint 16 
from a cd to sda1, sda2 being the original home directory. Everything 
worked so I then went to upgrade to Mint 17 using the Mr Meowski method. 
But the sources list would not work,  There were in fact no entries in 
/etc/apt/sources.list, only a line saying
# deb cdrom:[Linux Mint 16 _qiana_ - Release i386 20131128]/ trusty 
contrib main non-free    which I assume is from the cd install.
So, I went into synaptic and updated the repositories from petra to 
qiana and saucy to trusty, came out of synaptic and ran apt-get 
dist-upgrade, which it did.  So, I now had a fully working installation 
of Mint 17 which I proceeded to embellish with all the useful cruft 
which I can't live without. Worked OK except that I can't seem to 
install a working copy of Vbox.
I think it is down to my sources.list (which now has a line I put in deb 
http://download.virtualbox.org/virtualbox/debian qiana contrib) but 
doesn't work from that either.  I believe that the problem is the 
sources this damned installation is working from.  Where are they? I've 
had a hunt but can't find them.  Any suggestions please.
George

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