@Luksus In my case nothing happened as the partition was already 786432 blocks long, so that did not help.

What I am more wondering about is why is the partition table created exactly like it is? It's clearly made by Ubuntu Installer and not Android (when Android [e.g. LineageOS] is installed, the partition table is definitely different.) And the partitions are crazy (see below)

So I hypothesise that it's possible to change the partition table setup [e.g. create root at /dev/sdaX, see below] at installation time, but not sure yet how -- any ideas?

Also, I see that /dev/sde is 4GB. I wonder if this is on the hardware level, or there is another mapping level done by linux kernel -- will check this again by reinstalling Android and looking at the devices. journalctl or dmesg don't hint whether or not these are separate devices; however, udev shows each of them has its own SCSI LUN which I think implies these are indeed separate devices.

P.S.
/dev/sda: 113.6G (out of those, 113.2G mounted at /userdata)
/dev/sdb: 4M
/dev/sdc: 4M
/dev/sdd: 128M
/dev/sde: 4G
/dev/sdf: 1.5 (1G mounted at /var/lib/lxc/android/rootfs/vendor)

Partition table for /dev/sde:

Disk /dev/sde: 4 GiB, 4294967296 bytes, 1048576 sectors Disk model: KLUDG4U1EA-B0C1 Units: sectors of 1 * 4096 = 4096 bytes Sector size (logical/physical): 4096 bytes / 4096 bytes I/O size (minimum/optimal): 8192 bytes / 8192 bytes Disklabel type: gpt Disk identifier: 98101B32-BBE2-4BF2-A06E-2BB33D000C20 Device Start End Sectors Size Type /dev/sde1 6 133 128 512K unknown /dev/sde2 134 261 128 512K unknown /dev/sde3 262 773 512 2M unknown /dev/sde4 774 1285 512 2M unknown /dev/sde5 1286 1413 128 512K unknown /dev/sde6 1414 1541 128 512K unknown /dev/sde7 1542 1545 4 16K unknown /dev/sde8 1546 1673 128 512K unknown /dev/sde9 1674 1801 128 512K unknown /dev/sde10 1802 29961 28160 110M Microsoft basic data /dev/sde11 29962 34057 4096 16M unknown /dev/sde12 34058 35081 1024 4M unknown /dev/sde13 35082 36105 1024 4M unknown /dev/sde14 36106 36361 256 1M unknown /dev/sde15 36362 44553 8192 32M unknown /dev/sde16 44554 46601 2048 8M unknown /dev/sde17 46602 48649 2048 8M unknown /dev/sde18 48650 52745 4096 16M unknown /dev/sde19 52746 69129 16384 64M unknown /dev/sde20 69130 85513 16384 64M unknown /dev/sde21 85514 871945 786432 3G unknown /dev/sde22 871946 888329 16384 64M unknown /dev/sde23 888330 888330 1 4K unknown /dev/sde24 888331 888586 256 1M unknown /dev/sde25 888587 888714 128 512K unknown /dev/sde26 888715 888842 128 512K unknown /dev/sde27 888843 888970 128 512K unknown /dev/sde28 888971 889098 128 512K unknown /dev/sde29 889099 889226 128 512K unknown /dev/sde30 889227 889354 128 512K unknown /dev/sde31 889355 889418 64 256K unknown /dev/sde32 889419 889482 64 256K unknown /dev/sde33 889483 889483 1 4K unknown /dev/sde34 889484 897839 8356 32.7M unknown /dev/sde35 897840 897840 1 4K unknown /dev/sde36 897841 898096 256 1M unknown /dev/sde37 898097 900144 2048 8M unknown /dev/sde38 900145 900656 512 2M unknown /dev/sde39 900657 900688 32 128K unknown /dev/sde40 900689 917072 16384 64M unknown /dev/sde41 917073 917104 32 128K unknown /dev/sde42 917105 917136 32 128K unknown /dev/sde43 917137 917648 512 2M unknown /dev/sde44 917649 918160 512 2M unknown /dev/sde45 918161 918672 512 2M unknown /dev/sde46 918673 919184 512 2M unknown /dev/sde47 919185 927376 8192 32M unknown /dev/sde48 927377 1048570 121194 473.4M unknown

Partition labels for all devices:

lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/modemst2 -> ../../sdf2 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/modemst1 -> ../../sdf1 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/fw_8v1ee -> ../../sde44 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/fw_4g9n4 -> ../../sde45 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/minidump -> ../../sde47 lrwxrwxrwx 1 root root 10 Feb 25 12:56 /dev/disk/by-partlabel/pmicbak -> ../../sde9 lrwxrwxrwx 1 root root 10 Feb 25 12:56 /dev/disk/by-partlabel/hypbak -> ../../sde6 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/vendor -> ../../sdf6 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/fw_4t0n8 -> ../../sde46 lrwxrwxrwx 1 root root 10 Feb 25 12:56 /dev/disk/by-partlabel/hyp -> ../../sde5 lrwxrwxrwx 1 root root 10 Feb 25 12:56 /dev/disk/by-partlabel/pmic -> ../../sde8 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/reserve3 -> ../../sdf7 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/fsc -> ../../sdf4 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/fsg -> ../../sdf3 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/md5 -> ../../sdf5 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/logdump -> ../../sde40 lrwxrwxrwx 1 root root 10 Feb 25 12:56 /dev/disk/by-partlabel/sec -> ../../sde7 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/fw_4j1ed -> ../../sde43 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/logfs -> ../../sde37 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/cmnlib -> ../../sde27 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/toolsfv -> ../../sde36 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/storsec -> ../../sde41 lrwxrwxrwx 1 root root 10 Feb 25 12:56 /dev/disk/by-partlabel/tz -> ../../sde3 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/msadp -> ../../sde32 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/recovery -> ../../sde22 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/storsecbak -> ../../sde42 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/cmnlibbak -> ../../sde28 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/keymasterbak -> ../../sde26 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/splash -> ../../sde34 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/apdp -> ../../sde31 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/cmnlib64bak -> ../../sde30 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/system -> ../../sde21 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/dpo -> ../../sde33 lrwxrwxrwx 1 root root 10 Feb 25 12:56 /dev/disk/by-partlabel/tzbak -> ../../sde4 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/cmnlib64 -> ../../sde29 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/sti -> ../../sde38 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/devcfg -> ../../sde39 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/boot_aging -> ../../sde20 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/limits -> ../../sde35 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/boot -> ../../sde19 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/modem -> ../../sde10 lrwxrwxrwx 1 root root 11 Feb 25 12:57 /dev/disk/by-partlabel/reserve1 -> ../../sda10 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/keymaster -> ../../sde25 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/bluetooth -> ../../sde24 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/xblbak -> ../../sdc1 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/ablbak -> ../../sde17 lrwxrwxrwx 1 root root 10 Feb 25 12:56 /dev/disk/by-partlabel/rpmbak -> ../../sde2 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/LOGO -> ../../sde18 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/xbl -> ../../sdb1 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/devinfo -> ../../sde23 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/mdtp -> ../../sde15 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/abl -> ../../sde16 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/dsp -> ../../sde11 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/dip -> ../../sde14 lrwxrwxrwx 1 root root 10 Feb 25 12:57 /dev/disk/by-partlabel/oem_dycnvbk -> ../../sda7 lrwxrwxrwx 1 root root 10 Feb 25 12:57 /dev/disk/by-partlabel/cache -> ../../sda3 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/mdtpsecapp -> ../../sde12 lrwxrwxrwx 1 root root 10 Feb 25 12:57 /dev/disk/by-partlabel/oem_stanvbk -> ../../sda8 lrwxrwxrwx 1 root root 10 Feb 25 12:57 /dev/disk/by-partlabel/persist -> ../../sda2 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/ddr -> ../../sdd3 lrwxrwxrwx 1 root root 10 Feb 25 12:56 /dev/disk/by-partlabel/rpm -> ../../sde1 lrwxrwxrwx 1 root root 11 Feb 25 12:57 /dev/disk/by-partlabel/userdata -> ../../sda13 lrwxrwxrwx 1 root root 11 Feb 25 12:57 /dev/disk/by-partlabel/reserve2 -> ../../sda11 lrwxrwxrwx 1 root root 10 Feb 25 12:57 /dev/disk/by-partlabel/misc -> ../../sda4 lrwxrwxrwx 1 root root 10 Feb 25 12:57 /dev/disk/by-partlabel/param -> ../../sda9 lrwxrwxrwx 1 root root 11 Feb 25 12:57 /dev/disk/by-partlabel/config -> ../../sda12 lrwxrwxrwx 1 root root 10 Feb 25 12:57 /dev/disk/by-partlabel/frp -> ../../sda6 lrwxrwxrwx 1 root root 10 Feb 25 12:57 /dev/disk/by-partlabel/keystore -> ../../sda5 lrwxrwxrwx 1 root root 11 Feb 25 12:56 /dev/disk/by-partlabel/mdtpsecappbak -> ../../sde13 lrwxrwxrwx 1 root root 10 Feb 25 12:57 /dev/disk/by-partlabel/ssd -> ../../sda1 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/cdt -> ../../sdd2 lrwxrwxrwx 1 root root 10 Feb 25 12:11 /dev/disk/by-partlabel/reserve -> ../../sdd1

Why can't you install OpenCV in libertine?