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How are you trying to mount NTFS partition?
pmount? mount? GUI filemanager?
Could you specify where the message was displayed?
{Ctrl+Alt+F2}
{login as user}
su -c "service slim stop && apt-get purge slim"
cp .xinitrc .xinitrc.backup #if exist, just in case
nano ~/.xinitrc
startx
.xinitrc:
#!/bin/sh
/usr/bin/startxfce4 #or a command for starting another WM/DE
Congratulations. Slim was not just disabled but also removed from your system because you said "I don't need it". From now you can run graphical desktop only with startx command. If you want GUI login you have to install display manager (XDM, KDM, GDM, LightDM, Slim, ...). If you want to run another DE or WM you have to edit .xinitrc file or run it from your working WM/DE.
If you want packages personally for your aims you can use checkinstall+fakeroot to build them: https://debian-administration.org/artic … eckinstall
This is the easiest way.
Because i am from venezuela, and the internet conection for download packages is really slow and in to many cases, i just had a usb stick of 1 GB and for that reason is not practical for me just download the DVD ISO Image of Disc 1 of Devuan installation.
Looks like you need a local mirror of Devuan repository. It will be about 150-170Gb for AMD64+i386 architectures. If you will find or organize local LUG (Linux User Group) it will be possible to make a local infrastructure for that.
upd.
There is also AppImage package format. you can consider it for desktop apps. It doesn't require package manager at all. Just download and run an application.
A lot of games from Steam via Proton/SteamPlay works fine (even those which doesn't work on windows anymore). The only thing is needed for now is to install recent Mesa and Vulkan drivers. Devuan is a good solution because Devuan Ceres has everything required for that.
Which OpenCL implementation have you tried?