Maybe I did something wrong, but this kernel (4.18) causes a kernel panic. The process I followed was same as always, to wget the *.deb, dpkg -i *.deb && update-grub at the end to ensure this kernel is used:

[    6.538003] evm: security.SMACK64
[    6.539108] evm: security.SMACK64EXEC
[    6.540387] evm: security.SMACK64TRANSMUTE
[    6.541798] evm: security.SMACK64MMAP
[    6.543023] evm: security.apparmor
[    6.544209] evm: security.ima
[    6.545253] evm: security6.668405] usb 2-1: New USB device found, idVendor=8087, idProduct=8002, bcdDevice= 0.05
[    6.885734] evm: HMAC attrs: 0x1
[    6.886472]   Magic number: 14:225:302
[    7.048969] usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    7.050067] tty tty31: hash matches
[    7.054948] memory memory160: hash matches
[    7.056460] rtc_cmos 00:00: setting system clock to 2018-08-14 23:16:59 UTC (1534288619)
[    7.056552] hub 2-1:1.0: USB hub found
[    7.060431] hub 2-1:1.0: 8 ports detected
[    7.063051] md: Waiting for all devices to be available before autodetect
[    7.093858] md: If you don't use raid, use raid=noautodetect
[    7.118684] md: Autodetecting RAID arrays.
[    7.137860] md: autorun ...
[    7.150409] md: ... autorun DONE.
[    7.165346] VFS: Cannot open root device "sda1" or unknown-block(0,0): error -6
[    7.197757] Please append a correct "root=" boot option; here are the available partitions:
[    7.235391] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    7.273379] CPU: 6 PID: 1 Comm: swapper/0 Not tainted 4.18.0-041800-generic #201808122131
[    7.310122] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, BIOS P89 01/22/2018
[    7.544633] Call Trace:
[    7.555562]  dump_stack+0x63/0x83
[    7.570510]  panic+0xe7/0x247
[    7.583414]  mount_block_root+0x231/0x2d8
[    7.601354]  ? do_early_param+0x95/0x95
[    7.618598]  mount_root+0x7c/0x7f
[    7.634231]  prepare_namespace+0x139/0x171
[    7.653611]  kernel_init_freeable+0x236/0x261
[    7.673689]  ? rest_init+0xb0/0xb0
[    7.688884]  kernel_init+0xe/0x104
[    7.704165]  ret_from_fork+0x35/0x40
[    7.720293] Kernel Offset: 0x29e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[    7.772913] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---
[    7.815580] ------------[ cut here ]------------
[    7.836276] sched: Unexpected reschedule of offline CPU#0!
[    7.860432] WARNING: CPU: 6 PID: 1 at arch/x86/kernel/smp.c:128 native_smp_send_reschedule+0x3a/0x40
[    7.902510] Modules linked in:
[    7.916373] CPU: 6 PID: 1 Comm: swapper/0 Not tainted 4.18.0-041800-generic #201808122131
[    7.953258] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, BIOS P89 01/22/2018
[    8.089242] RIP: 0010:native_smp_send_reschedule+0x3a/0x40
[    8.113868] Code: cf 62 01 73 17 48 8b 05 94 8c 17 01 be fd 00 00 00 48 8b 40 30 e8 06 a1 ba 00 5d c3 89 fe 48 c7 c7 58 c1 ed ab e8 48 41 03 00 <0f> 0b 5d c3 66 90 0f 1f 44 00 00 55 48 89 e5 53 48 83 ec 20 65 48
[    8.198752] RSP: 0000:ffff8cc61f383e08 EFLAGS: 00010086
[    8.222224] RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffffac262608
[    8.254674] RDX: 0000000000000001 RSI: 0000000000000096 RDI: 0000000000000046
[    8.287087] RBP: ffff8cc61f383e08 R08: 00000000000cc2b4 R09: 0000000000000358
[    8.319325] R10: 000000000000000f R11: ffffffffac7837ed R12: 0000000000000000
[    8.351381] R13: 0000000000000003 R14: ffff8cc61b474500 R15: ffffffffaaf24bc0
[    8.383431] FS:  0000000000000000(0000) GS:ffff8cc61f380000(0000) knlGS:0000000000000000
[    8.419863] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.446342] CR2: 0000000000000000 CR3: 00000001b020a001 CR4: 00000000003606e0
[    8.479621] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    8.516202] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    8.550084] Call Trace:
[    8.560999]  <IRQ>
[    8.570157]  kick_ilb+0x85/0x90
[    8.584223]  trigger_load_balance+0xa3/0x190
[    8.603397]  ? tick_sched_do_timer+0x60/0x60
[    8.623122]  scheduler_tick+0xae/0xd0
[    8.639704]  update_process_times+0x42/0x60
[    8.658527]  tick_sched_handle+0x29/0x60
[    8.676734]  tick_sched_timer+0x3c/0x80
[    8.694426]  __hrtimer_run_queues+0x107/0x270
[    8.714088]  hrtimer_interrupt+0x101/0x220
[    8.732405]  smp_apic_timer_interrupt+0x67/0x130
[    8.753195]  apic_timer_interrupt+0xf/0x20
[    8.771190]  </IRQ>
[    8.780539] RIP: 0010:panic+0x201/0x247
[    8.798007] Code: eb a6 83 3d 27 ee 8e 01 00 74 05 e8 10 6b 02 00 48 c7 c6 20 c1 77 ac 48 c7 c7 78 59 ee ab e8 a0 59 06 00 fb 66 0f 1f 44 00 00 <31> db e8 2f a7 0d 00 4c 39 eb 7c 1d 41 83 f4 01 48 8b 05 cf ed 8e
[    8.882850] RSP: 0000:ffffa274c3167d78 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
[    8.917249] RAX: 000000000000005c RBX: ffff8cc619067000 RCX: ffffffffac262608
[    8.949417] RDX: 0000000000000000 RSI: 0000000000000082 RDI: 0000000000000046
[    8.981366] RBP: ffffa274c3167de8 R08: 00000000000bcb31 R09: 0000000000000356
[    9.017448] R10: 000000000000000f R11: ffffffffac7837ed R12: 0000000000000000
[    9.051883] R13: 0000000000000000 R14: fffff916216419c0 R15: 0000000000008001
[    9.084046]  ? panic+0x1fa/0x247
[    9.099276]  mount_block_root+0x231/0x2d8
[    9.117938]  ? do_early_param+0x95/0x95
[    9.135476]  mount_root+0x7c/0x7f
[    9.150972]  prepare_namespace+0x139/0x171
[    9.169734]  kernel_init_freeable+0x236/0x261
[    9.189339]  ? rest_init+0xb0/0xb0
[    9.204836]  kernel_init+0xe/0x104
[    9.220112]  ret_from_fork+0x35/0x40
[    9.236398] ---[ end trace a95f39a63f49be66 ]---