You should first do a checksum to verify the integrity of your TW image…
Then, try again.
sometimes an initial install fails due to random bits in the universe…
But I think I am little confused.
You write the iso on a dvd, right?
If you install from a dvd, do you need a usb flash?
You said that if usb flash not plugged - and all work fine?
Sorry but English it is not my first language (sometimes I use google translate :shame:).
Tumbleweed 20180324 x86_64 NET.iso CD-RW UEFI Mode Install done without USB Flash Memory
I did dmesg | tail -20 with USB Flash Memory
dmesg | tail -20
24.954624] r8169 0000:02:00.0 enp2s0: link down
24.954627] r8169 0000:02:00.0 enp2s0: link down
24.954765] IPv6: ADDRCONF(NETDEV_UP): enp2s0: link is not ready
27.911215] r8169 0000:02:00.0 enp2s0: link up
27.911233] IPv6: ADDRCONF(NETDEV_CHANGE): enp2s0: link becomes ready
28.009359] NET: Registered protocol family 17
31.440510] talpa-vfshook: Enabled
32.749156] talpa-vfshook: devpts is on the skip list, not patching
32.749216] talpa-vfshook: mqueue is on the skip list, not patching
32.749229] talpa-vfshook: Patching hugetlbfs
32.765723] talpa-vfshook: proc is on the skip list, not patching
32.765825] talpa-vfshook: proc is on the skip list, not patching
32.765903] talpa-vfshook: proc is on the skip list, not patching
32.765981] talpa-vfshook: proc is on the skip list, not patching
32.766055] talpa-vfshook: proc is on the skip list, not patching
32.766132] talpa-vfshook: proc is on the skip list, not patching
32.766210] talpa-vfshook: proc is on the skip list, not patching
32.766277] talpa-vfshook: proc is on the skip list, not patching
32.766358] talpa-vfshook: proc is on the skip list, not patching
55.166509] talpa-deny: Error occurred while opening /sys/firmware/efi/efivars/OsIndicationsSupported-8be4df61-93ca-11d2-aa0d-00e098