You can actually install the Liquorix Kernel on LMDE2 if you just install the linux-image and don't install the linux-headers
- the last one is the one that actually needs gcc-5.
The downside is that you cannot run Virtualbox (it will fail to compile the kernel modules) or compile stuff that depends on the kernel headers. Apart from not being able to use Virtualbox, I do not have any other downside with running Liquorix on my "daily driver".
But if you need to run Virtualbox just every once in a while, what you can do is install some other kernel image and headers and then install Virtualbox. The Linux Kernels option on the Mint Update Manager is quite good and practical for doing this.
Run Liquorix on your everyday, and when you have to run Virtualbox, just reboot with the other kernel. Just be aware that if you hibernate using the other kernel, when you wake up the machine you must boot with the same kernel, or the resume process will fail and if you lose the hibernation flags from the OS and/or the hibernation data is deleted/overwritten/lost from the swap partition, you can lose data.
I have Liquorix (just the linux-image) running in both my LMDE2 machines, 32 and 64 bits, for quite some time on the 32 bits and now on the 64 bits.
I've found this note to myself from May: If you want to install gcc-5, add this do your /etc/apt/sources.list
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deb http://ftp.de.debian.org/debian stretch main
You then need to run the
command and then you can go to Synaptic and try to install gcc-5. Can't remember if this did it but I assume it will.Be aware that your repos will point to Debian Testing and a lot of packages on your system can be updated, but they will run the Testing version and not the Stable one.
You can point your repos to Testing, install gcc-5, move back to the regular repos (delete or comment the line from your /etc/apt/sources.list) and make sure you run the sudo apt update again in order to make sure your package update information is not pointing to Testing!
(I guess you could do something with apt pinning just to update the gcc-5 related packages, but honestly i've never bothered to learn the apt pinning stuff)
Regarding old versions of the Liquorix kernel, you can download a few from theIndex of /mepiscr/testrepo/pool/test/l/linux-liquorixhttp://main.mepis-deb.org/mepiscr/testrepo/pool/test/l/linux-liquorix/
Hope I could have helped something...