This output worried me, so I thought asking here first:
osmc@osmc:~$ sudo apt-get update && sudo apt-get dist-upgrade && sudo apt-get autoclean
Ign http://ftp.debian.org stretch InRelease
Get:1 http://ftp.debian.org stretch-updates InRelease [91.0 kB]
Get:2 http://security.debian.org stretch/updates InRelease [63.0 kB]
Get:3 http://apt.osmc.tv stretch InRelease [4,667 B]
Get:4 http://ftp.debian.org stretch Release.gpg [2,434 B]
Get:5 http://ftp.debian.org stretch Release [118 kB]
Get:6 http://security.debian.org stretch/updates/main i386 Packages [266 kB]
Get:7 http://security.debian.org stretch/updates/contrib i386 Packages [1,352 B]
Get:8 http://ftp.debian.org stretch-updates/contrib i386 Packages [32 B]
Get:9 http://security.debian.org stretch/updates/non-free i386 Packages [1,268 B]
Get:10 http://ftp.debian.org stretch-updates/non-free i386 Packages [32 B]
Get:11 http://security.debian.org stretch/updates/contrib Translation-en [1,023 B]
Err http://apt.osmc.tv stretch/main i386 Packages
Get:12 http://ftp.debian.org stretch-updates/contrib Translation-en [14 B]
Get:13 http://ftp.debian.org stretch-updates/main Translation-en [3,583 B]
Get:14 http://ftp.debian.org stretch-updates/non-free Translation-en [14 B]
Get:15 http://ftp.debian.org stretch-updates/main i386 Packages [5,956 B]
Get:16 http://security.debian.org stretch/updates/main Translation-en [116 kB]
Get:17 http://security.debian.org stretch/updates/non-free Translation-en [481 B]
Get:18 http://ftp.debian.org stretch/main i386 Packages [7,103 kB]
Err http://apt.osmc.tv stretch/main i386 Packages
Get:19 http://apt.osmc.tv stretch/main i386 Packages [7,342 B]
Ign http://apt.osmc.tv stretch/main Translation-en_GB
Ign http://apt.osmc.tv stretch/main Translation-en
Get:20 http://ftp.debian.org stretch/contrib i386 Packages [47.9 kB]
Get:21 http://ftp.debian.org stretch/non-free i386 Packages [68.9 kB]
Get:22 http://ftp.debian.org stretch/contrib Translation-en [45.9 kB]
Get:23 http://ftp.debian.org stretch/main Translation-en [5,393 kB]
Get:24 http://ftp.debian.org stretch/non-free Translation-en [79.2 kB]
Fetched 13.4 MB in 28s (477 kB/s)
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... The following packages were automatically installed and are no longer required:
alsa-utils cpp cpp-4.9 cpp-6 fontconfig-config fonts-dejavu-core
glx-alternative-mesa glx-alternative-nvidia glx-diversions i386-libass-osmc
i386-libbluray-osmc i386-libcec-osmc i386-libcrossguid-osmc
i386-libcrystalhd-osmc i386-libnfs-osmc i386-librtmp-osmc
i386-libshairplay-osmc i386-libsqlite-osmc keyboard-configuration
libapt-inst1.5 libasound2 libasound2-data libavahi-client3 libbind9-90
libcdio13 libcloog-isl4 libconfuse-common libcups2 libdbus-1-dev libdns100
libdpkg-perl libdrm-amdgpu1 libdrm-intel1 libdrm-nouveau2 libdrm-radeon1
libdrm2 libegl1-mesa libelf1 libenca0 libepoxy0 libevdev2 libfftw3-single3
libfontconfig1 libfontenc1 libfreetype6 libfribidi0 libgbm1 libgif4
libgl1-mesa-glx libgl1-nvidia-legacy-304xx-glx libglapi-mesa libglew1.10
libglu1-mesa libgomp1 libgraphite2-3 libharfbuzz0b libice6 libicu52
libinput-bin libinput10 libisc95 libisccc90 libisccfg90 libisl10 libisl15
libjbig0 libjpeg62-turbo liblcms2-2 libldb1 libllvm3.5 libllvm3.9 liblwres90
liblzo2-2 libmad0 libmicrohttpd10 libmongo-client0 libmpc3 libmpfr4 libmtdev1
libmysqlclient18 libntdb1 libnvidia-legacy-304xx-glcore libogg0 libpciaccess0
libpcrecpp0 libperl4-corelibs-perl libpixman-1-0 libplist2 libpng16-16 libpsl0
libpython2.7 libsamplerate0 libsensors4 libsm6 libsmbclient libssh-4
libtag1-vanilla libtdb1 libtevent0 libtiff5 libtinyxml2.6.2 libvorbis0a
libvorbisenc2 libwacom-common libwacom2 libwayland-client0 libwayland-server0
libwebp5 libwebp6 libwebpdemux1 libwebpdemux2 libwebpmux1 libwebpmux2
libx11-xcb1 libxatracker2 libxaw7 libxcb-dri2-0 libxcb-dri3-0 libxcb-glx0
libxcb-present0 libxcb-render0 libxcb-shape0 libxcb-sync1 libxcb-util0
libxcb-xfixes0 libxcursor1 libxdamage1 libxfixes3 libxfont1 libxfont2 libxi6
libxinerama1 libxkbfile1 libxmu6 libxpm4 libxrandr2 libxrender1 libxshmfence1
libxslt1.1 libxss1 libxt6 libxtst6 libxv1 libxvmc1 libxxf86vm1
mediacenter-addon-osmc mediacenter-eventclients-common-osmc
mediacenter-send-osmc mediacenter-skin-osmc mysql-common
nvidia-installer-cleanup nvidia-legacy-304xx-alternative nvidia-support
nvidia-xconfig pkg-config python-chardet python-dbus-dev python-imaging
python-pexpect python-pil python-pkg-resources python-ptyprocess
python-requests python-six python-talloc python-unidecode python-urllib3
samba-libs update-glx x11-common x11-xkb-utils x11-xserver-utils xfonts-base
xfonts-encodings xfonts-utils xinit xkb-data xserver-common xserver-xorg
xserver-xorg-core xserver-xorg-input-all xserver-xorg-input-evdev
xserver-xorg-input-libinput xserver-xorg-input-mouse
xserver-xorg-input-synaptics xserver-xorg-legacy xserver-xorg-video-all
xserver-xorg-video-amdgpu xserver-xorg-video-ati xserver-xorg-video-cirrus
xserver-xorg-video-fbdev xserver-xorg-video-intel xserver-xorg-video-mach64
xserver-xorg-video-mga xserver-xorg-video-neomagic xserver-xorg-video-nouveau
xserver-xorg-video-nvidia-legacy-304xx xserver-xorg-video-openchrome
xserver-xorg-video-r128 xserver-xorg-video-radeon xserver-xorg-video-savage
xserver-xorg-video-siliconmotion xserver-xorg-video-sisusb
xserver-xorg-video-tdfx xserver-xorg-video-trident xserver-xorg-video-vesa
xserver-xorg-video-vmware
Use 'apt-get autoremove' to remove them.
Done
The following packages will be REMOVED:
atv-device-osmc atv-mediacenter-osmc diskmount-osmc libconfuse0
module-init-tools perl-modules udisks-glue xserver-xorg-input-vmmouse
xserver-xorg-video-modesetting
The following NEW packages will be installed:
cpp-6 dirmngr gcc-6-base gnupg-agent keyutils libapparmor1 libapt-inst2.0
libapt-pkg5.0 libassuan0 libatomic1 libbind9-140 libbson-1.0-0 libc-l10n
libdbus-1-dev libdns162 libdpkg-perl libdrm-amdgpu1 libfdisk1 libfftw3-single3
libgnutls30 libgomp1 libhogweed4 libicu57 libidn2-0 libinput-bin libinput10
libip4tc0 libip6tc0 libiptc0 libisc160 libisccc140 libisccfg140 libisl15
libjson-c3 libksba8 libldap-common libllvm3.9 liblwres141 liblz4-1
libmagic-mgc libmnl0 libmongoc-1.0-0 libnetfilter-conntrack3 libnettle6
libnghttp2-14 libnpth0 libntfs-3g871 libnvidia-legacy-304xx-glcore libperl5.24
libpng16-16 libprocps6 libpsl5 libreadline7 libseccomp2 libsensors4
libssl1.0.2 libssl1.1 libunistring0 libutempter0 libwacom-common libwacom2
libwebp6 libwebpdemux2 libwebpmux2 libxfont2 libxinerama1 libxss1 libxtables12
perl-modules-5.24 pinentry-curses python-ptyprocess syslog-ng-mod-journal
update-glx xserver-xorg-input-libinput xserver-xorg-legacy
xserver-xorg-video-amdgpu xxd
The following packages will be upgraded:
acl adduser alsa-utils apt apt-utils avahi-daemon b43-fwcutter base-files
base-files-osmc base-passwd bash bind9-host bluez bsdutils busybox bzip2
ca-certificates ccze cifs-utils coreutils cpp cron curl dash dbus debconf
debconf-i18n debian-archive-keyring debianutils dialog diffutils dmsetup
dosfstools dpkg e2fslibs e2fsprogs eject exfat-fuse exfat-utils fbset
findutils firmware-b43-installer fontconfig-config fonts-dejavu-core fuse
gir1.2-glib-2.0 glx-alternative-mesa glx-alternative-nvidia glx-diversions
gnupg gpgv grep gzip haveged hdparm hfsprogs hfsutils hostname init
init-system-helpers initscripts insserv iptables kbd keyboard-configuration
kmod less lftp libacl1 libasound2 libasound2-data libatasmart4 libattr1
libaudit-common libaudit1 libavahi-client3 libavahi-common-data
libavahi-common3 libavahi-core7 libblkid1 libbsd0 libbz2-1.0 libc-bin libc6
libcap-ng0 libcap2 libcap2-bin libcdio13 libcloog-isl4 libcomerr2
libconfuse-common libcryptsetup4 libcups2 libcurl3 libdb5.3 libdbi1
libdbus-1-3 libdbus-glib-1-2 libdebconfclient0 libdevmapper-event1.02.1
libdevmapper1.02.1 libdrm-intel1 libdrm-nouveau2 libdrm-radeon1 libdrm2
libedit2 libegl1-mesa libelf1 libenca0 libepoxy0 libevdev2 libevent-2.0-5
libevtlog0 libexpat1 libffi6 libfontconfig1 libfontenc1 libfreetype6
libfribidi0 libfuse2 libgbm1 libgcc1 libgcrypt20 libgdbm3 libgeoip1
libgirepository-1.0-1 libgl1-mesa-glx libgl1-nvidia-legacy-304xx-glx
libglapi-mesa libglib2.0-0 libglu1-mesa libgmp10 libgpg-error0 libgpm2
libgraphite2-3 libgssapi-krb5-2 libgudev-1.0-0 libharfbuzz0b libhavege1
libice6 libidn11 libivykis0 libjbig0 libjpeg62-turbo libk5crypto3 libkeyutils1
libkmod2 libkrb5-3 libkrb5support0 liblcms2-2 libldap-2.4-2 libldb1
liblocale-gettext-perl liblvm2app2.2 liblzma5 liblzo2-2 libmagic1
libmongo-client0 libmount1 libmpc3 libmpfr4 libmtdev1 libncurses5 libncursesw5
libnfsidmap2 libnl-3-200 libnl-genl-3-200 libnspr4 libnss-mdns
libnss-myhostname libnss3 libntdb1 libopts25 libp11-kit0 libpam-modules
libpam-modules-bin libpam-runtime libpam-systemd libpam0g libparted2
libpciaccess0 libpcre3 libpcsclite1 libperl4-corelibs-perl libpixman-1-0
libpolkit-agent-1-0 libpolkit-backend-1-0 libpolkit-gobject-1-0 libpopt0
libpython-stdlib libpython2.7 libpython2.7-minimal libpython2.7-stdlib
libqdbm14 librtmp1 libsamplerate0 libsasl2-2 libsasl2-modules-db libselinux1
libsemanage-common libsemanage1 libsepol1 libsgutils2-2 libslang2 libsm6
libsmartcols1 libsmbclient libsqlite3-0 libss2 libssh-4 libssh2-1 libstdc++6
libsystemd0 libtalloc2 libtasn1-6 libtdb1 libtevent0 libtext-charwidth-perl
libtext-iconv-perl libtext-wrapi18n-perl libtiff5 libtinfo5 libtirpc1 libudev1
libupsclient4 libusb-0.1-4 libusb-1.0-0 libustr-1.0-1 libuuid1 libvorbis0a
libvorbisenc2 libwayland-client0 libwayland-server0 libwbclient0 libwrap0
libx11-6 libx11-data libx11-xcb1 libxatracker2 libxaw7 libxcb-dri2-0
libxcb-dri3-0 libxcb-glx0 libxcb-present0 libxcb-render0 libxcb-shape0
libxcb-sync1 libxcb-util0 libxcb-xfixes0 libxcb1 libxcursor1 libxdamage1
libxdmcp6 libxext6 libxfixes3 libxfont1 libxi6 libxkbfile1 libxml2 libxmu6
libxmuu1 libxpm4 libxrandr2 libxrender1 libxshmfence1 libxslt1.1 libxt6
libxtst6 libxv1 libxvmc1 libxxf86vm1 libyajl2 locales login logrotate lsb-base
lsof make mawk mediacenter-addon-osmc mediacenter-eventclients-common-osmc
mediacenter-send-osmc mediacenter-skin-osmc mime-support mount
multiarch-support mysql-common nano ncurses-base ncurses-bin net-tools netbase
nfs-common niceprioritypolicy-osmc ntfs-3g ntp nut nut-client nut-server
nvidia-installer-cleanup nvidia-legacy-304xx-alternative nvidia-support
nvidia-xconfig openssh-client openssh-server openssh-sftp-server openssl
passwd perftune-osmc perl perl-base pkg-config policykit-1 procps psmisc
python python-apt python-apt-common python-chardet python-dbus python-dbus-dev
python-gi python-gobject python-gobject-2 python-imaging python-minimal
python-pexpect python-pil python-pkg-resources python-requests python-six
python-talloc python-unidecode python-urllib3 python2.7 python2.7-minimal
readline-common rpcbind rsync samba-common samba-libs sed sensible-utils
ssh-app-osmc startpar sudo syslog-ng syslog-ng-core syslog-ng-mod-json
syslog-ng-mod-mongodb syslog-ng-mod-sql systemd systemd-sysv sysv-rc
sysvinit-utils tar tmux tree tzdata ucf udev usbutils util-linux vim
vim-common vim-runtime wget wireless-firmware-osmc wpasupplicant x11-common
x11-xkb-utils x11-xserver-utils xauth xfonts-base xfonts-utils xinit xkb-data
xserver-common xserver-xorg xserver-xorg-core xserver-xorg-input-all
xserver-xorg-input-evdev xserver-xorg-input-mouse xserver-xorg-input-synaptics
xserver-xorg-video-all xserver-xorg-video-ati xserver-xorg-video-cirrus
xserver-xorg-video-fbdev xserver-xorg-video-intel xserver-xorg-video-mach64
xserver-xorg-video-mga xserver-xorg-video-neomagic xserver-xorg-video-nouveau
xserver-xorg-video-nvidia-legacy-304xx xserver-xorg-video-openchrome
xserver-xorg-video-r128 xserver-xorg-video-radeon xserver-xorg-video-savage
xserver-xorg-video-siliconmotion xserver-xorg-video-sisusb
xserver-xorg-video-tdfx xserver-xorg-video-trident xserver-xorg-video-vesa
xserver-xorg-video-vmware zlib1g
405 upgraded, 77 newly installed, 9 to remove and 0 not upgraded.
Need to get 196 MB of archives.
After this operation, 37.5 MB of additional disk space will be used.
Do you want to continue? [Y/n]
If I update all these packages, and atv-device-osmc, atv-mediacenter-osmc, among others are removed, how can I get OSMC back?