joao@SERVER:/$ uname -a
Linux SERVER 4.18.0-13-lowlatency #14-Ubuntu SMP PREEMPT Wed Dec 5 12:12:14 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

joao@SERVER:/$ egrep '(vmx|svm)' /proc/cpuinfo
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy **svm** extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb hw_pstate sme ssbd sev ibpb vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 xsaves clzero irperf xsaveerptr arat npt lbrv **svm_lock** nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov succor smca

$ sudo apt-get install xen-hypervisor-amd64

joao@SERVER:/$ xl list
ERROR:  Can't find hypervisor information in sysfs!

joao@SERVER:/boot$ ls
abi-4.18.0-10-lowlatency                  memtest86+.elf
config-4.18.0-10-lowlatency               memtest86+_multiboot.bin
config-4.18.0-13-lowlatency               retpoline-4.18.0-10-lowlatency
efi                                       System.map-4.18.0-10-lowlatency
grub                                      System.map-4.18.0-13-lowlatency
initrd.img-4.18.0-10-lowlatency           vmlinuz-4.18.0-10-lowlatency
initrd.img-4.18.0-13-lowlatency           vmlinuz-4.18.0-13-lowlatency
initrd.img-4.18.0-13-lowlatency.old-dkms  xen-4.9-amd64.efi
memtest86+.bin                            xen-4.9-amd64.gz

joao@SERVER:/etc/grub.d$ ls
00_header        08_linux_xen   20_linux       30_os-prober      40_custom  README
05_debian_theme  09_lowlatency  20_memtest86+  30_uefi-firmware  41_custom

joao@SERVER:/etc/grub.d$ mv -i /etc/grub.d/10_linux /etc/grub.d/50_linux
mv: não foi possível obter estado de '/etc/grub.d/10_linux': Arquivo ou diretório inexistente

joao@SERVER:/$ locate 10_linux
joao@SERVER:/$ locate 50_linux