APT error and Command Line help. apt-get not working
 

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My apt will not run any command, e.g. sudo apt-get ____. The error message I am getting is-

relocation error: /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0: symbol _ZN13pkgSourceList16AddVolatileFilesER11CommandLinePSt6vectorINSt7__cxx1112basic_stringIcSt11char_tr aitsIcESaIcEEESaIS8_EE version APTKG_5.0 not defined in file libapt-pkg.so.5.0 with link time reference

Info- Im running Ubuntu 18.04 bionic. running[dpkg -l apt libapt-pkg5.0] shows the following-- "Apt running on- 1.4.6~17.04.1" "libapt=pkg5.0:amd64 running on- 1.2.29"

running [md5sum /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0 /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0] Shows- "868c9bb9cd23bacc2f76182902eb489d /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0" "12e8c8000ae4f61d6ec50ca9218b428d /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0 "

I only have access to recovery mode and Cntrl+Alt+F1 can someone please help me?

Been mixing repo's eh?
TBH if apt is hosed, unless you want to spend a long time learning new things, you should probably just reinstall.

would there be a way to reinstall without losing personal data and can you tell me how?

Well that really depends how your system is set up and what backup strategy you are using.
Worst case - no separate /home partition and no backup (come on - it's 2019!) - boot from a live system disk/usb and copy off what you need to an external drive or such.

is there no way to fix the apt error?

Yes, there very probably is.
Again, it depends ... on how you got in this situation and what other damage has been done.

I got into this situation from updating from 17.04 - 18.04 via the update gui and when it got to the resating phase of the updates it would not allow me to log in (black screen) or us apt commands.

That is not a supported upgrade - you need to go from 17.04 to 17.10 then 18.04.
Besides apt (which is the primary tool you need), it's likely there are many other critical components in inconsistent states that will need research and manual intervention to fix.

Everything is fixable, given enough time and knowledge - how much time do you want to devote to this?

I don't know you or what you already know, but based purely on your post count and my gut feeling, it's likely to be days/weeks and you will need to become intimately familiar with the inner workings of Ubuntu and it's packaging system.

If you just want a working system, get a live disk, save your data and do a fresh install.

but if you want to repair it first please post the content of /etc/apt/sources.list and /etc/apt/sources.list.d

You can do the live boot from cd/usb and copy the files you need or if you do new install and choose not to format the root partition if this is where the /home is located then it will install overtop what is present leaving the files intact that are already there and not on the install disk. Namely your home files and whatever is left over from the old install. Probably not the best way to get them back.