两周以来，我在启动 Ubuntu 20.04 时遇到了麻烦（我有一个 Windows 10 双启动）。启动时间比平时长，特别是在我输入密码后，它在一个只有光标的黑屏上挂起大约 30 秒。一段时间后，我启动到桌面，但互联网连接没有连接。在调查了网络在“设置”选项卡中，它显示NetworkManager 需要运行。
我可以通过将系统重置为以前的版本来缓解此问题时间移位。这将从备份中恢复系统文件，并且它会一直工作直到我再次重新启动。然后问题会再次出现，我需要再次使用 TimeShift 重置。
今天，我从 USB 上完全重新安装了 Ubuntu 20.04，希望这能解决问题。它工作正常，直到我再次重新启动。然后同样的问题再次出现。经过进一步调查，我发现我也无法运行sudo命令。输入 后，终端就挂起了sudo。我运行strace sudo，得到了以下输出：
prlimit64(0, RLIMIT_NOFILE, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = -1 EPERM (Operation not permitted)
prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=RLIM64_INFINITY}, NULL) = -1 EPERM (Operation not permitted)
prlimit64(0, RLIMIT_NOFILE, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0
prlimit64(0, RLIMIT_NPROC, NULL, {rlim_cur=256566, rlim_max=256566}) = 0
prlimit64(0, RLIMIT_NPROC, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = -1 EPERM (Operation not permitted)
prlimit64(0, RLIMIT_NPROC, {rlim_cur=256566, rlim_max=256566}, NULL) = 0
prlimit64(0, RLIMIT_RSS, NULL, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_RSS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}, NULL) = 0
fcntl(0, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(1, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(2, F_GETFL) = 0x2 (flags O_RDWR)
openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=5703712, ...}) = 0
mmap(NULL, 5703712, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f0fdbb70000
close(3) = 0
openat(AT_FDCWD, "/etc/localtime", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2940, ...}) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=2940, ...}) = 0
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\16\0\0\0\16\0\0\0\0"..., 4096) = 2940
lseek(3, -1846, SEEK_CUR) = 1094
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\16\0\0\0\16\0\0\0\0"..., 4096) = 1846
close(3) = 0
stat("/etc/sudo.conf", 0x7fffc9da7300) = -1 ENOENT (No such file or directory)
geteuid() = 1000
access("/usr/local/sbin/sudo", X_OK) = -1 ENOENT (No such file or directory)
access("/usr/local/bin/sudo", X_OK) = -1 ENOENT (No such file or directory)
access("/usr/sbin/sudo", X_OK) = -1 ENOENT (No such file or directory)
access("/usr/bin/sudo", X_OK) = 0
stat("/usr/bin/sudo", {st_mode=S_IFREG|S_ISUID|0755, st_size=166056, ...}) = 0
openat(AT_FDCWD, "/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2996, ...}) = 0
read(3, "# Locale name alias data base.\n#"..., 4096) = 2996
read(3, "", 4096) = 0
close(3) = 0
openat(AT_FDCWD, "/usr/share/locale/en_US.UTF-8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en_US.utf8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en_US/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en.UTF-8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en.utf8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en_US/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en.utf8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, "sudo", 4sudo) = 4
write(2, ": ", 2: ) = 2
write(2, "effective uid is not 0, is /usr/"..., 133effective uid is not 0, is /usr/bin/sudo on a file system with the 'nosuid' option set or an NFS file system without root privileges?) = 133
write(2, "\n", 1
) = 1
exit_group(1) = ?
+++ exited with 1 +++
prlimit64(0, RLIMIT_NOFILE, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = -1 EPERM (Operation not permitted)
prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=RLIM64_INFINITY}, NULL) = -1 EPERM (Operation not permitted)
prlimit64(0, RLIMIT_NOFILE, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0
prlimit64(0, RLIMIT_NPROC, NULL, {rlim_cur=256566, rlim_max=256566}) = 0
prlimit64(0, RLIMIT_NPROC, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = -1 EPERM (Operation not permitted)
prlimit64(0, RLIMIT_NPROC, {rlim_cur=256566, rlim_max=256566}, NULL) = 0
prlimit64(0, RLIMIT_RSS, NULL, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_RSS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}, NULL) = 0
fcntl(0, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(1, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(2, F_GETFL) = 0x2 (flags O_RDWR)
openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=5703712, ...}) = 0
mmap(NULL, 5703712, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f0fdbb70000
close(3) = 0
openat(AT_FDCWD, "/etc/localtime", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2940, ...}) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=2940, ...}) = 0
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\16\0\0\0\16\0\0\0\0"..., 4096) = 2940
lseek(3, -1846, SEEK_CUR) = 1094
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\16\0\0\0\16\0\0\0\0"..., 4096) = 1846
close(3) = 0
stat("/etc/sudo.conf", 0x7fffc9da7300) = -1 ENOENT (No such file or directory)
geteuid() = 1000
access("/usr/local/sbin/sudo", X_OK) = -1 ENOENT (No such file or directory)
access("/usr/local/bin/sudo", X_OK) = -1 ENOENT (No such file or directory)
access("/usr/sbin/sudo", X_OK) = -1 ENOENT (No such file or directory)
access("/usr/bin/sudo", X_OK) = 0
stat("/usr/bin/sudo", {st_mode=S_IFREG|S_ISUID|0755, st_size=166056, ...}) = 0
openat(AT_FDCWD, "/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2996, ...}) = 0
read(3, "# Locale name alias data base.\n#"..., 4096) = 2996
read(3, "", 4096) = 0
close(3) = 0
openat(AT_FDCWD, "/usr/share/locale/en_US.UTF-8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en_US.utf8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en_US/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en.UTF-8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en.utf8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en_US/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en.utf8/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en/LC_MESSAGES/sudo.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, "sudo", 4sudo) = 4
write(2, ": ", 2: ) = 2
write(2, "effective uid is not 0, is /usr/"..., 133effective uid is not 0, is /usr/bin/sudo on a file system with the 'nosuid' option set or an NFS file system without root privileges?) = 133
write(2, "\n", 1
) = 1
exit_group(1) = ?
+++ exited with 1 +++
我搜索了类似的术语/usr/bin/sudo on a file system with the 'nosuid' option set or an NFS file system without root privileges并尝试这进入恢复模式但没有成功。有谁能帮我解决这个问题？